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/live.py

@@ -0,0 +1,33 @@
+import asyncio
+
+from fastapi import APIRouter, WebSocket, WebSocketDisconnect
+
+from server.services.downloads import downloads
+from server.services.live import live
+from server.services.sessions import sessions
+
+router = APIRouter()
+
+
+def _payload() -> dict:
+    profile = sessions.snapshot()
+    return {
+        "downloads": downloads.snapshot(),
+        "profile": profile["profile"] if profile else None,
+    }
+
+
+@router.websocket("/api/live")
+async def live_socket(websocket: WebSocket):
+    await websocket.accept()
+    seen = -1
+    try:
+        while True:
+            revision = await asyncio.to_thread(live.wait, seen, 20)
+            if revision != seen:
+                seen = revision
+                await websocket.send_json(_payload())
+            else:
+                await websocket.send_json({"type": "ping"})
+    except WebSocketDisconnect:
+        return