feat: 补齐桌面端下载播放，并将窗口改为夜间主题和应用图标

server/routes/play.py

@@ -0,0 +1,89 @@
+from urllib.parse import urlsplit
+
+import httpx
+from fastapi import APIRouter, HTTPException
+from fastapi.responses import Response, StreamingResponse
+from pydantic import BaseModel
+
+from server.schemas import DeviceBody, device_payload
+from server.services.device import DeviceProfile
+from server.services.http import http
+from server.services import playlist as playlists
+from server.services.sessions import sessions
+
+router = APIRouter(prefix="/api/play")
+
+
+class PlayBody(BaseModel):
+    token: str = ""
+    device: DeviceBody | None = None
+    vid: int
+
+
+def _device(token: str, raw: dict | None) -> DeviceProfile | None:
+    if not token:
+        return None
+    if raw:
+        return sessions.bind(token, DeviceProfile.merge(raw))
+    return sessions.device_for(token)
+
+
+def _public_url(url: str) -> str:
+    parts = urlsplit(url)
+    if parts.scheme not in ("http", "https") or not parts.hostname:
+        raise HTTPException(status_code=400, detail="播放地址无效")
+    return url
+
+
+@router.post("/episodes")
+def list_episodes(body: PlayBody):
+    device = _device(body.token, device_payload(body.device))
+    try:
+        rows = playlists.load_episodes(body.token, device, body.vid)
+    except RuntimeError as exc:
+        raise HTTPException(status_code=400, detail=str(exc)) from exc
+    return {
+        "episodes": [
+            {
+                "cid": ep["cid"],
+                "idx": ep["idx"],
+                "title": ep["title"],
+                "playable": bool(ep.get("src")),
+            }
+            for ep in rows
+        ]
+    }
+
+
+@router.get("/segment")
+def play_segment(url: str):
+    target = _public_url(url)
+    try:
+        upstream = http.open_stream(target)
+    except (httpx.HTTPError, TimeoutError, OSError, RuntimeError) as exc:
+        raise HTTPException(status_code=502, detail="分片读取失败") from exc
+    media = upstream.headers.get("content-type", "video/mp2t").split(";", 1)[0].strip() or "video/mp2t"
+
+    def chunks():
+        try:
+            for chunk in upstream.iter_bytes(64 * 1024):
+                if chunk:
+                    yield chunk
+        finally:
+            upstream.close()
+
+    return StreamingResponse(chunks(), media_type=media)
+
+
+@router.get("/{vid}/{cid}/index.m3u8")
+def episode_playlist(vid: int, cid: int):
+    token = sessions.active_token()
+    device = sessions.device_for(token) if token else None
+    src = playlists.episode_src(token, device, vid, cid)
+    if not src:
+        raise HTTPException(status_code=404, detail="这一集还没有可播放的地址")
+    try:
+        text = playlists.playback_playlist(src)
+    except RuntimeError as exc:
+        raise HTTPException(status_code=502, detail=str(exc)) from exc
+    return Response(text, media_type="application/vnd.apple.mpegurl", headers={"Cache-Control": "no-store"})