refactor: fake room routing moved to connect-time, fully decoupled from production

- server.py / main.py no longer reference fake_room at all (no import,
  no --fake-room flag, no _apply_fake_room)
- Routing decision happens at connect time in DanmakuClient.start():
  room_id == 1 dynamically imports fake_room.py and patches blivedm;
  any other room id returns immediately without touching fake_room
- Switching back from room 1 to another room unpatches to real Bilibili
- Production (packaged, no fake_room.py) is completely unaffected for
  normal room ids; room 1 without fake_room.py raises a clear error
- Rebuild portable zip (83.9 MB)

server.py

@@ -151,21 +151,6 @@ async def index_handler(request: web.Request) -> web.Response:
     return web.FileResponse(STATIC_DIR / "index.html")
 
 
-FAKE_ROOM_PORT = 8081  # fake_room.py default = bot web UI port (8080) + 1
-
-
-def _apply_fake_room(room_id: int) -> None:
-    """room_id == 1 routes to the local fake room (dev/testing); otherwise restore real Bilibili."""
-    import importlib
-
-    fake = importlib.import_module("fake_room")
-    if room_id == 1:
-        fake.patch_blivedm(FAKE_ROOM_PORT)
-        logger.info("[dev] room 1 -> fake room on port %d", FAKE_ROOM_PORT)
-    else:
-        fake.unpatch_blivedm()
-
-
 async def api_start(request: web.Request) -> web.Response:
     try:
         config = await request.json()
@@ -188,7 +173,6 @@ async def api_start(request: web.Request) -> web.Response:
             await tts_service.stop()
         except Exception:
             pass
-    _apply_fake_room(room_id)
     tts_service.set_cookies(login_session.cookies if login_session.is_logged_in else None)
     try:
         await tts_service.start(config)
@@ -316,8 +300,6 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument("--port", "-p", type=int, default=8080)
     parser.add_argument("--host", type=str, default="127.0.0.1")
     parser.add_argument("--debug", "-d", action="store_true")
-    parser.add_argument("--fake-room", type=int, default=0, metavar="PORT",
-                        help="connect to local fake_room.py instead of real Bilibili (dev/testing only)")
     return parser.parse_args()
 
 
@@ -330,12 +312,6 @@ def main() -> int:
     )
     logging.getLogger("aiohttp.access").setLevel(logging.WARNING)
 
-    if args.fake_room:
-        import importlib
-        fake = importlib.import_module("fake_room")
-        fake.patch_blivedm(args.fake_room)
-        print(f"  [dev] connected to fake room on port {args.fake_room}")
-
     app = create_app()
     print(f"\n  Bilibili Live → Yukkuri TTS Web UI")
     print(f"  Open: http://{args.host}:{args.port}\n")