diff --git a/app-android/app/src/main/AndroidManifest.xml b/app-android/app/src/main/AndroidManifest.xml
index 946aa6e..01457e1 100644
--- a/app-android/app/src/main/AndroidManifest.xml
+++ b/app-android/app/src/main/AndroidManifest.xml
@@ -12,6 +12,7 @@
     </queries>
 
     <application
+        android:name=".app.LifeEchoApp"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"
diff --git a/app-android/app/src/main/java/com/huaga/life_echo/app/AppContainer.kt b/app-android/app/src/main/java/com/huaga/life_echo/app/AppContainer.kt
new file mode 100644
index 0000000..b5a19cc
--- /dev/null
+++ b/app-android/app/src/main/java/com/huaga/life_echo/app/AppContainer.kt
@@ -0,0 +1,180 @@
+package com.huaga.life_echo.app
+
+import android.content.Context
+import com.huaga.life_echo.config.AppConfig
+import com.huaga.life_echo.data.auth.TokenManager
+import com.huaga.life_echo.data.database.AppDatabase
+import com.huaga.life_echo.data.repository.ChapterRepository
+import com.huaga.life_echo.data.repository.ConversationRepository
+import com.huaga.life_echo.data.repository.MessageRepository
+import com.huaga.life_echo.data.repository.PaymentRepository
+import com.huaga.life_echo.data.repository.ProfileRepository
+import com.huaga.life_echo.feature.memoir.adapters.MemoirApiAdapter
+import com.huaga.life_echo.feature.memoir.ports.MemoirApiPort
+import com.huaga.life_echo.feature.payment.adapters.PaymentApiAdapter
+import com.huaga.life_echo.feature.payment.ports.PaymentApiPort
+import com.huaga.life_echo.feature.profile.adapters.ProfileApiAdapter
+import com.huaga.life_echo.feature.profile.ports.ProfileApiPort
+import com.huaga.life_echo.network.ApiService
+import com.huaga.life_echo.network.AuthService
+import com.huaga.life_echo.network.WebSocketClient
+import com.huaga.life_echo.network.runtime.RealtimeTransportProvider
+import com.huaga.life_echo.network.runtime.RestClientProfile
+import com.huaga.life_echo.network.runtime.RestClientProvider
+import com.huaga.life_echo.payment.PaymentManager
+import io.ktor.client.HttpClient
+import io.ktor.client.engine.android.Android
+import io.ktor.client.engine.okhttp.OkHttp
+import io.ktor.client.plugins.HttpTimeout
+import io.ktor.client.plugins.auth.Auth
+import io.ktor.client.plugins.auth.providers.BearerTokens
+import io.ktor.client.plugins.auth.providers.bearer
+import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.client.plugins.logging.LogLevel
+import io.ktor.client.plugins.logging.Logging
+import io.ktor.client.plugins.websocket.WebSockets
+import io.ktor.serialization.kotlinx.json.json
+import kotlinx.serialization.json.Json
+
+class AppContainer(private val context: Context) {
+
+    val restClientProvider: RestClientProvider by lazy {
+        RestClientProvider(factory = ::createRestClient)
+    }
+
+    val realtimeTransportProvider: RealtimeTransportProvider by lazy {
+        RealtimeTransportProvider(factory = ::createRealtimeClient)
+    }
+
+    private val database by lazy { AppDatabase.getDatabase(context) }
+
+    val authService: AuthService by lazy { AuthService(restClientProvider) }
+
+    val apiService: ApiService by lazy {
+        ApiService(
+            provider = restClientProvider,
+            tokenManager = TokenManager,
+            authService = authService
+        )
+    }
+
+    val webSocketClient: WebSocketClient by lazy { WebSocketClient(realtimeTransportProvider) }
+
+    // Feature ports
+    val memoirApi: MemoirApiPort by lazy { MemoirApiAdapter(apiService) }
+    val profileApi: ProfileApiPort by lazy { ProfileApiAdapter(apiService) }
+    val paymentApi: PaymentApiPort by lazy { PaymentApiAdapter(apiService) }
+
+    // Repositories
+    val conversationRepository by lazy {
+        ConversationRepository(
+            conversationDao = database.conversationDao(),
+            segmentDao = database.conversationSegmentDao(),
+            apiService = apiService
+        )
+    }
+
+    val chapterRepository by lazy {
+        ChapterRepository(chapterDao = database.chapterDao())
+    }
+
+    val messageRepository by lazy {
+        MessageRepository(
+            messageDao = database.messageDao(),
+            apiService = apiService
+        )
+    }
+
+    val paymentRepository by lazy {
+        PaymentRepository(paymentApi = paymentApi)
+    }
+
+    val profileRepository by lazy {
+        ProfileRepository(profileApi = profileApi)
+    }
+
+    val paymentManager by lazy {
+        PaymentManager(
+            context = context.applicationContext,
+            wechatAppId = AppConfig.WECHAT_APP_ID
+        )
+    }
+
+    fun close() {
+        restClientProvider.close()
+        realtimeTransportProvider.close()
+    }
+
+    private fun createRestClient(profile: RestClientProfile): HttpClient {
+        return when (profile) {
+            RestClientProfile.AUTH -> HttpClient(Android) {
+                install(ContentNegotiation) {
+                    json(Json {
+                        ignoreUnknownKeys = true
+                        encodeDefaults = false
+                    })
+                }
+                install(Logging) { level = LogLevel.INFO }
+            }
+            RestClientProfile.API -> HttpClient(Android) {
+                install(ContentNegotiation) {
+                    json(Json { ignoreUnknownKeys = true })
+                }
+                install(Logging) { level = LogLevel.INFO }
+                install(HttpTimeout) {
+                    requestTimeoutMillis = 45_000
+                    connectTimeoutMillis = 15_000
+                    socketTimeoutMillis = 45_000
+                }
+                install(Auth) {
+                    bearer {
+                        loadTokens {
+                            val access = TokenManager.getAccessToken()
+                            val refresh = TokenManager.getRefreshToken()
+                            if (!access.isNullOrBlank() && !refresh.isNullOrBlank()) {
+                                BearerTokens(access, refresh)
+                            } else null
+                        }
+                        refreshTokens {
+                            val refresh = oldTokens?.refreshToken
+                                ?: TokenManager.getRefreshToken()
+                            if (!refresh.isNullOrBlank()) {
+                                val result = authService.refreshToken(refresh)
+                                result.fold(
+                                    onSuccess = { tokenResponse ->
+                                        TokenManager.saveTokens(
+                                            tokenResponse.access_token,
+                                            tokenResponse.refresh_token,
+                                            TokenManager.getUserId() ?: ""
+                                        )
+                                        BearerTokens(
+                                            tokenResponse.access_token,
+                                            tokenResponse.refresh_token
+                                        )
+                                    },
+                                    onFailure = {
+                                        TokenManager.clearTokens()
+                                        TokenManager.notifyTokenRefreshFailed()
+                                        null
+                                    }
+                                )
+                            } else {
+                                TokenManager.clearTokens()
+                                TokenManager.notifyTokenRefreshFailed()
+                                null
+                            }
+                        }
+                        sendWithoutRequest { true }
+                    }
+                }
+            }
+        }
+    }
+
+    private fun createRealtimeClient(): HttpClient {
+        return HttpClient(OkHttp) {
+            install(WebSockets)
+            install(Logging) { level = LogLevel.INFO }
+        }
+    }
+}
diff --git a/app-android/app/src/main/java/com/huaga/life_echo/app/LifeEchoApp.kt b/app-android/app/src/main/java/com/huaga/life_echo/app/LifeEchoApp.kt
new file mode 100644
index 0000000..b00f6b5
--- /dev/null
+++ b/app-android/app/src/main/java/com/huaga/life_echo/app/LifeEchoApp.kt
@@ -0,0 +1,23 @@
+package com.huaga.life_echo.app
+
+import android.app.Application
+import com.huaga.life_echo.data.auth.TokenManager
+import com.huaga.life_echo.ui.settings.AppSettings
+
+class LifeEchoApp : Application() {
+
+    lateinit var container: AppContainer
+        private set
+
+    override fun onCreate() {
+        super.onCreate()
+        TokenManager.initialize(this)
+        AppSettings.initialize(this)
+        container = AppContainer(this)
+    }
+
+    override fun onTerminate() {
+        super.onTerminate()
+        container.close()
+    }
+}
diff --git a/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/NetworkReadiness.kt b/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/NetworkReadiness.kt
new file mode 100644
index 0000000..9e48dbc
--- /dev/null
+++ b/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/NetworkReadiness.kt
@@ -0,0 +1,6 @@
+package com.huaga.life_echo.network.runtime
+
+enum class NetworkReadiness {
+    NotInitialized,
+    ClientReady,
+}
diff --git a/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/RealtimeTransportProvider.kt b/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/RealtimeTransportProvider.kt
new file mode 100644
index 0000000..6f6c8db
--- /dev/null
+++ b/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/RealtimeTransportProvider.kt
@@ -0,0 +1,31 @@
+package com.huaga.life_echo.network.runtime
+
+import io.ktor.client.HttpClient
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+class RealtimeTransportProvider(
+    private val factory: () -> HttpClient,
+) {
+    private var client: HttpClient? = null
+    private val _readiness = MutableStateFlow(NetworkReadiness.NotInitialized)
+    val readiness: StateFlow<NetworkReadiness> = _readiness.asStateFlow()
+
+    fun warmUp() {
+        getClient()
+    }
+
+    fun getClient(): HttpClient {
+        return client ?: factory().also {
+            client = it
+            _readiness.value = NetworkReadiness.ClientReady
+        }
+    }
+
+    fun close() {
+        client?.close()
+        client = null
+        _readiness.value = NetworkReadiness.NotInitialized
+    }
+}
diff --git a/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/RestClientProvider.kt b/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/RestClientProvider.kt
new file mode 100644
index 0000000..5587fbc
--- /dev/null
+++ b/app-android/app/src/main/java/com/huaga/life_echo/network/runtime/RestClientProvider.kt
@@ -0,0 +1,34 @@
+package com.huaga.life_echo.network.runtime
+
+import io.ktor.client.HttpClient
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+enum class RestClientProfile { AUTH, API }
+
+class RestClientProvider(
+    private val factory: (RestClientProfile) -> HttpClient,
+) {
+    private val clients = mutableMapOf<RestClientProfile, HttpClient>()
+    private val _readiness = MutableStateFlow(NetworkReadiness.NotInitialized)
+    val readiness: StateFlow<NetworkReadiness> = _readiness.asStateFlow()
+
+    fun getClient(profile: RestClientProfile): HttpClient {
+        return clients.getOrPut(profile) {
+            factory(profile).also {
+                _readiness.value = NetworkReadiness.ClientReady
+            }
+        }
+    }
+
+    fun warmUp() {
+        RestClientProfile.entries.forEach { getClient(it) }
+    }
+
+    fun close() {
+        clients.values.forEach { it.close() }
+        clients.clear()
+        _readiness.value = NetworkReadiness.NotInitialized
+    }
+}
diff --git a/app-android/app/src/test/java/com/huaga/life_echo/network/runtime/RealtimeTransportProviderTest.kt b/app-android/app/src/test/java/com/huaga/life_echo/network/runtime/RealtimeTransportProviderTest.kt
new file mode 100644
index 0000000..c0c0433
--- /dev/null
+++ b/app-android/app/src/test/java/com/huaga/life_echo/network/runtime/RealtimeTransportProviderTest.kt
@@ -0,0 +1,43 @@
+package com.huaga.life_echo.network.runtime
+
+import io.ktor.client.HttpClient
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertSame
+import org.junit.Test
+import org.mockito.Mockito
+
+class RealtimeTransportProviderTest {
+
+    private val fakeFactory: () -> HttpClient = {
+        Mockito.mock(HttpClient::class.java)
+    }
+
+    @Test
+    fun realtime_provider_only_reports_client_ready_after_warmup_or_getClient() {
+        val provider = RealtimeTransportProvider(factory = fakeFactory)
+
+        assertEquals(NetworkReadiness.NotInitialized, provider.readiness.value)
+        provider.warmUp()
+        assertEquals(NetworkReadiness.ClientReady, provider.readiness.value)
+    }
+
+    @Test
+    fun get_client_returns_same_instance() {
+        val provider = RealtimeTransportProvider(factory = fakeFactory)
+
+        val client1 = provider.getClient()
+        val client2 = provider.getClient()
+
+        assertSame(client1, client2)
+    }
+
+    @Test
+    fun close_resets_readiness_to_not_initialized() {
+        val provider = RealtimeTransportProvider(factory = fakeFactory)
+        provider.warmUp()
+
+        provider.close()
+
+        assertEquals(NetworkReadiness.NotInitialized, provider.readiness.value)
+    }
+}
diff --git a/app-android/app/src/test/java/com/huaga/life_echo/network/runtime/RestClientProviderTest.kt b/app-android/app/src/test/java/com/huaga/life_echo/network/runtime/RestClientProviderTest.kt
new file mode 100644
index 0000000..ac3580d
--- /dev/null
+++ b/app-android/app/src/test/java/com/huaga/life_echo/network/runtime/RestClientProviderTest.kt
@@ -0,0 +1,66 @@
+package com.huaga.life_echo.network.runtime
+
+import io.ktor.client.HttpClient
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNotSame
+import org.junit.Assert.assertSame
+import org.junit.Test
+import org.mockito.Mockito
+
+class RestClientProviderTest {
+
+    private val fakeFactory: (RestClientProfile) -> HttpClient = {
+        Mockito.mock(HttpClient::class.java)
+    }
+
+    @Test
+    fun auth_and_api_clients_are_stable_per_profile_until_close() {
+        val provider = RestClientProvider(factory = fakeFactory)
+        val auth1 = provider.getClient(RestClientProfile.AUTH)
+        val auth2 = provider.getClient(RestClientProfile.AUTH)
+        val api1 = provider.getClient(RestClientProfile.API)
+
+        assertSame(auth1, auth2)
+        assertNotSame(auth1, api1)
+    }
+
+    @Test
+    fun readiness_is_not_initialized_before_any_client_is_requested() {
+        val provider = RestClientProvider(factory = fakeFactory)
+
+        assertEquals(NetworkReadiness.NotInitialized, provider.readiness.value)
+    }
+
+    @Test
+    fun readiness_is_client_ready_after_get_client() {
+        val provider = RestClientProvider(factory = fakeFactory)
+
+        provider.getClient(RestClientProfile.AUTH)
+
+        assertEquals(NetworkReadiness.ClientReady, provider.readiness.value)
+    }
+
+    @Test
+    fun warm_up_creates_all_profiles_and_reports_ready() {
+        val created = mutableListOf<RestClientProfile>()
+        val provider = RestClientProvider { profile ->
+            created += profile
+            Mockito.mock(HttpClient::class.java)
+        }
+
+        provider.warmUp()
+
+        assertEquals(RestClientProfile.entries.toList(), created)
+        assertEquals(NetworkReadiness.ClientReady, provider.readiness.value)
+    }
+
+    @Test
+    fun close_resets_readiness_to_not_initialized() {
+        val provider = RestClientProvider(factory = fakeFactory)
+        provider.warmUp()
+
+        provider.close()
+
+        assertEquals(NetworkReadiness.NotInitialized, provider.readiness.value)
+    }
+}