feat(profile): avatar presets, upload, nickname editing

- FastAPI: preset assets 01–08, GET list/static, PUT /me/avatar/preset,
  safer uploaded-avatar path validation, preset_avatars + HTTP tests.
- Expo: personal-info (library + presets), profile tab avatar,
  resolveApiMediaUrl, auth hooks cache sync, Web multipart helper,
  partial-save messaging + profile i18n.
- Includes existing edits to conversation screen and voice use-player.

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

app-expo/src/features/voice/hooks/use-player.ts

@@ -15,6 +15,10 @@ interface UsePlayerResult {
   enqueue: (item: PlaybackItem) => void;
   /** Replace queue and play this item (e.g. user voice bubble vs other sources). */
   enqueueExclusive: (item: PlaybackItem) => Promise<void>;
+  /** Pause native playback without draining queue（与 stop 清空队列不同）。 */
+  pausePlayback: () => void;
+  /** Continue after pausePlayback（需 status === 'paused'） */
+  resumePlayback: () => void;
   stop: () => void;
 }
 
@@ -68,9 +72,11 @@ export function usePlayer(): UsePlayerResult {
   useEffect(() => {
     if (!currentSource || !player) return;
     if (!playerStatus.isLoaded) return;
+    /** 先于 isLoaded「抢暂停」时需保留暂停，避免本条自动 play 覆盖 pause */
+    if (status === 'paused') return;
     player.play();
     isPlayingRef.current = true;
-  }, [currentSource, player, playerStatus.isLoaded]);
+  }, [currentSource, player, playerStatus.isLoaded, status]);
 
   const playNext = useCallback(async () => {
     if (isPlayNextInProgressRef.current) return;
@@ -114,6 +120,7 @@ export function usePlayer(): UsePlayerResult {
 
   // Detect playback completion → advance queue（必须曾 playing，避免换源瞬间沿用上一条的 duration/currentTime）
   useEffect(() => {
+    if (status === 'paused') return;
     if (!currentSource || !isPlayingRef.current) return;
 
     const { playing, currentTime, duration } = playerStatus;
@@ -128,7 +135,32 @@ export function usePlayer(): UsePlayerResult {
       isPlayingRef.current = false;
       playNext();
     }
-  }, [playerStatus, currentSource, playNext]);
+  }, [playerStatus, currentSource, playNext, status]);
+
+  const pausePlayback = useCallback(() => {
+    setStatus((s) => {
+      if (s !== 'playing') return s;
+      if (player) {
+        player.pause();
+      }
+      isPlayingRef.current = false;
+      return 'paused';
+    });
+  }, [player]);
+
+  const resumePlayback = useCallback(async () => {
+    if (status !== 'paused') return;
+    const acquired = await audioFocus.acquireForPlayback();
+    if (!acquired) {
+      setStatus('idle');
+      return;
+    }
+    if (!player) return;
+    if (!playerStatus.isLoaded) return;
+    player.play();
+    setStatus('playing');
+    isPlayingRef.current = true;
+  }, [status, player, playerStatus.isLoaded]);
 
   // Subscribe to audioFocus owner changes for recorder → idle recovery
   useEffect(() => {
@@ -205,6 +237,8 @@ export function usePlayer(): UsePlayerResult {
     currentPlaybackItem,
     enqueue,
     enqueueExclusive,
+    pausePlayback,
+    resumePlayback,
     stop,
   };
 }