feat: add Transmission monitoring to dashboard

- Add backend API for Transmission RPC integration
- Create frontend page with torrent and tracker status
- Add health monitoring script
- Display daemon status, speeds, and tracker errors
- Support reannounce, start/stop actions

dashboard/backend/main.py

@@ -39,6 +39,7 @@ from routers import (
     system,
     terminal,
     totp,
+    transmission,
 )
 
 _tz_cst = timezone(timedelta(hours=8))
@@ -303,6 +304,9 @@ app.include_router(
 app.include_router(
     security.router, prefix="/api/security", dependencies=[Depends(_inject_user), Depends(require_page("security"))]
 )
+app.include_router(
+    transmission.router, dependencies=[Depends(_inject_user), Depends(require_page("transmission"))]
+)
 
 # OPC endpoints
 app.include_router(