feat: improve replay workflow and viewer UI

Co-Authored-By: Claude Fable 5 <[email protected]>

backend/main.py

@@ -9,8 +9,11 @@ import httpx
 import asyncio
 import time
 import psutil
-from database import init_db
+from database import init_db, session_factory
 from services.transcoder import transcode_mgr
+from services.stream_service import StreamService
+from services.media_service import media_service
+from models.stream import StreamStatus
 from routes import streams_router, nodes_router, auth_router
 from routes.settings_route import router as settings_router
 from config import settings
@@ -60,6 +63,16 @@ async def monitor_origin():
 async def lifespan(app: FastAPI):
     load_nodes()
     await init_db()
+    os.makedirs(settings.hls_runtime_dir, exist_ok=True)
+    async with session_factory() as db:
+        service = StreamService(db)
+        for stream in await service.get_all_streams():
+            if stream.status == StreamStatus.live:
+                transcode_mgr.start_transcode(
+                    stream.stream_key,
+                    media_service.get_rtmp_url(stream.stream_key),
+                    service.effective_renditions(stream),
+                )
     origin_monitor = asyncio.create_task(monitor_origin())
     yield
     origin_monitor.cancel()