fix(guest): add playCollection permission so guests can Play All playlist/album (#103)

- New guest flag playCollection (default OFF), gates play-playlist/play-album
- Keeps playNow's non-destructive semantics intact (Play All clears the queue)
- Admin-toggleable in Settings → 游客模式; default-off, backward-compatible
- Frontend: gate the 播放全部 button on the flag + surface 403 as a toast
  instead of failing silently (the silent-failure half of the issue)

src/web/api/permissions-enforcement.test.ts

@@ -301,6 +301,7 @@ const guest = (perms: Partial<Record<string, boolean>> = {}) => ({
     transport: false,
     removeClear: false,
     playMode: false,
+    playCollection: false,
     ...perms,
   },
 });
@@ -373,7 +374,19 @@ describe("guest enforcement on player routes", () => {
     expect((await request(mountGuest({ transport: true })).post(`/api/player/${ALLOWED_BOT}/add-song`).send({ song: SONG })).status).toBe(403);
   });
 
-  it("guests are always denied /play, /prev, /stop, /play-song, /play-at, /play-playlist, /play-album, /playlist, /profile even with ALL flags on", async () => {
+  it("playCollection flag gates /play-playlist, /play-album (issue #103)", async () => {
+    const allow = mountGuest({ playCollection: true });
+    const deny = mountGuest({ playCollection: false });
+    expect((await request(allow).post(`/api/player/${ALLOWED_BOT}/play-playlist`).send({ playlistId: "1" })).status).not.toBe(403);
+    expect((await request(allow).post(`/api/player/${ALLOWED_BOT}/play-album`).send({ albumId: "1" })).status).not.toBe(403);
+    expect((await request(deny).post(`/api/player/${ALLOWED_BOT}/play-playlist`).send({ playlistId: "1" })).status).toBe(403);
+    expect((await request(deny).post(`/api/player/${ALLOWED_BOT}/play-album`).send({ albumId: "1" })).status).toBe(403);
+    // playCollection does NOT leak into the destructive single-song / queue ops.
+    expect((await request(allow).post(`/api/player/${ALLOWED_BOT}/play`).send({ query: "x" })).status).toBe(403);
+    expect((await request(allow).post(`/api/player/${ALLOWED_BOT}/play-song`).send({ song: SONG })).status).toBe(403);
+  });
+
+  it("guests are always denied /play, /prev, /stop, /play-song, /play-at, /playlist, /profile even with ALL flags on", async () => {
     const all = mountGuest({
       addToQueue: true,
       playNext: true,
@@ -382,14 +395,13 @@ describe("guest enforcement on player routes", () => {
       transport: true,
       removeClear: true,
       playMode: true,
+      playCollection: true,
     });
     expect((await request(all).post(`/api/player/${ALLOWED_BOT}/play`).send({ query: "x" })).status).toBe(403);
     expect((await request(all).post(`/api/player/${ALLOWED_BOT}/prev`)).status).toBe(403);
     expect((await request(all).post(`/api/player/${ALLOWED_BOT}/stop`)).status).toBe(403);
     expect((await request(all).post(`/api/player/${ALLOWED_BOT}/play-song`).send({ song: SONG })).status).toBe(403);
     expect((await request(all).post(`/api/player/${ALLOWED_BOT}/play-at`).send({ index: 0 })).status).toBe(403);
-    expect((await request(all).post(`/api/player/${ALLOWED_BOT}/play-playlist`).send({ playlistId: "1" })).status).toBe(403);
-    expect((await request(all).post(`/api/player/${ALLOWED_BOT}/play-album`).send({ albumId: "1" })).status).toBe(403);
     expect((await request(all).post(`/api/player/${ALLOWED_BOT}/playlist`).send({ playlistId: "1" })).status).toBe(403);
     expect((await request(all).put(`/api/player/${ALLOWED_BOT}/profile`).send({})).status).toBe(403);
   });

src/web/api/player.ts

@@ -265,7 +265,7 @@ export function createPlayerRouter(
 
   // Play a playlist by ID — stores metadata only, resolves URL for first song
   // Respects current play mode (random = pick random first song)
-  router.post("/:botId/play-playlist", authorize({ capability: "player.control" }), async (req, res) => {
+  router.post("/:botId/play-playlist", authorize({ capability: "player.control", guestFlag: "playCollection" }), async (req, res) => {
     try {
       const bot = (req as any).bot;
       const { playlistId, platform } = req.body;
@@ -352,7 +352,7 @@ export function createPlayerRouter(
   });
 
   // Play an album by ID — mirrors play-playlist but calls getAlbumSongs
-  router.post("/:botId/play-album", authorize({ capability: "player.control" }), async (req, res) => {
+  router.post("/:botId/play-album", authorize({ capability: "player.control", guestFlag: "playCollection" }), async (req, res) => {
     try {
       const bot = (req as any).bot;
       const { albumId, platform } = req.body;

src/web/api/session.test.ts

@@ -217,6 +217,7 @@ describe("session router — guest mode", () => {
         transport: false,
         removeClear: false,
         playMode: false,
+        playCollection: false,
       },
       guestBots: "all",
     });