feat: 新增套餐余额页面与个人资料入口

- 新增PlanBalanceScreen套餐余额屏幕
- 更新ProfileScreen个人资料页面入口

Co-authored-by: Cursor <cursoragent@cursor.com>

app-android/app/src/main/java/com/huaga/life_echo/ui/screens/PlanBalanceScreen.kt

@@ -0,0 +1,173 @@
+package com.huaga.life_echo.ui.screens
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.huaga.life_echo.ui.components.common.LoadingIndicator
+import com.huaga.life_echo.ui.components.payment.QuotaIndicator
+import com.huaga.life_echo.ui.icons.AppIcons
+import com.huaga.life_echo.ui.theme.LightPurple
+import com.huaga.life_echo.ui.theme.MediumPurple
+import com.huaga.life_echo.ui.theme.SlatePurple
+import com.huaga.life_echo.ui.viewmodel.PaymentViewModel
+import com.huaga.life_echo.ui.viewmodel.ViewModelFactory
+
+/**
+ * 套餐余额页：展示当前套餐账户剩余额度（对话轮数、章节等）
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun PlanBalanceScreen(
+    navController: androidx.navigation.NavHostController? = null,
+    viewModel: PaymentViewModel = viewModel(
+        factory = ViewModelFactory(LocalContext.current)
+    )
+) {
+    val quota by viewModel.quota.collectAsState()
+    val currentPlan by viewModel.currentPlan.collectAsState()
+    val isLoading by viewModel.isLoading.collectAsState()
+
+    LaunchedEffect(Unit) {
+        viewModel.checkQuota()
+        viewModel.loadCurrentPlan()
+    }
+
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = { Text("套餐余额") },
+                navigationIcon = {
+                    IconButton(onClick = { navController?.popBackStack() }) {
+                        Icon(
+                            imageVector = AppIcons.ArrowBack,
+                            contentDescription = "返回",
+                            tint = Color.White
+                        )
+                    }
+                },
+                actions = {
+                    IconButton(
+                        onClick = {
+                            viewModel.checkQuota()
+                        }
+                    ) {
+                        Icon(
+                            imageVector = AppIcons.Refresh,
+                            contentDescription = "刷新",
+                            tint = Color.White
+                        )
+                    }
+                },
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = MediumPurple,
+                    titleContentColor = Color.White,
+                    navigationIconContentColor = Color.White,
+                    actionIconContentColor = Color.White
+                )
+            )
+        }
+    ) { paddingValues ->
+        if (isLoading && quota == null) {
+            LoadingIndicator(modifier = Modifier.padding(paddingValues))
+        } else {
+            LazyColumn(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .padding(paddingValues)
+                    .background(MaterialTheme.colorScheme.background),
+                contentPadding = PaddingValues(16.dp),
+                verticalArrangement = Arrangement.spacedBy(16.dp)
+            ) {
+                currentPlan?.let { plan ->
+                    item {
+                        Card(
+                            modifier = Modifier.fillMaxWidth(),
+                            colors = CardDefaults.cardColors(containerColor = LightPurple.copy(alpha = 0.3f)),
+                            shape = MaterialTheme.shapes.medium
+                        ) {
+                            Row(
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .padding(16.dp),
+                                verticalAlignment = Alignment.CenterVertically,
+                                horizontalArrangement = Arrangement.SpaceBetween
+                            ) {
+                                Text(
+                                    text = "当前套餐",
+                                    fontSize = 14.sp,
+                                    color = SlatePurple
+                                )
+                                Text(
+                                    text = plan.displayName,
+                                    fontSize = 16.sp,
+                                    fontWeight = FontWeight.Bold,
+                                    color = MediumPurple
+                                )
+                            }
+                        }
+                    }
+                }
+                item {
+                    Text(
+                        text = "账户额度",
+                        fontSize = 15.sp,
+                        fontWeight = FontWeight.Medium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+                quota?.let { q ->
+                    item {
+                        QuotaIndicator(quota = q)
+                    }
+                } ?: item {
+                    Card(
+                        modifier = Modifier.fillMaxWidth(),
+                        colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surfaceVariant),
+                        shape = MaterialTheme.shapes.medium
+                    ) {
+                        Box(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(24.dp),
+                            contentAlignment = Alignment.Center
+                        ) {
+                            Text(
+                                text = "暂无额度信息，请稍后刷新",
+                                fontSize = 14.sp,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

app-android/app/src/main/java/com/huaga/life_echo/ui/screens/ProfileScreen.kt

@@ -184,6 +184,12 @@ fun ProfileScreen(
                         onPress = { navController?.navigate(Screen.PlanDetails.route) }
                     )
                 }
+                SettingItem(
+                    icon = AppIcons.Info,
+                    label = "套餐余额",
+                    description = "查看当前套餐剩余额度",
+                    onPress = { navController?.navigate(Screen.PlanBalance.route) }
+                )
                 SettingItem(
                     icon = AppIcons.Upgrade,
                     label = "升级套餐",