Add entity CRUD events over WebSocket with auto-refresh

Broadcast entity_changed and device_health_changed events via the event
bus so the frontend can auto-refresh cards without polling. Adds
exponential backoff on WS reconnect.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/api/routes/sync_clocks.py

@@ -4,6 +4,7 @@ from fastapi import APIRouter, Depends, HTTPException
 
 from wled_controller.api.auth import AuthRequired
 from wled_controller.api.dependencies import (
+    fire_entity_event,
     get_color_strip_store,
     get_sync_clock_manager,
     get_sync_clock_store,
@@ -70,6 +71,7 @@ async def create_sync_clock(
             description=data.description,
             tags=data.tags,
         )
+        fire_entity_event("sync_clock", "created", clock.id)
         return _to_response(clock, manager)
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
@@ -110,6 +112,7 @@ async def update_sync_clock(
         # Hot-update runtime speed
         if data.speed is not None:
             manager.update_speed(clock_id, clock.speed)
+        fire_entity_event("sync_clock", "updated", clock_id)
         return _to_response(clock, manager)
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
@@ -133,6 +136,7 @@ async def delete_sync_clock(
                 )
         manager.release_all_for(clock_id)
         store.delete_clock(clock_id)
+        fire_entity_event("sync_clock", "deleted", clock_id)
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))
 
@@ -152,6 +156,7 @@ async def pause_sync_clock(
     except ValueError as e:
         raise HTTPException(status_code=404, detail=str(e))
     manager.pause(clock_id)
+    fire_entity_event("sync_clock", "updated", clock_id)
     return _to_response(clock, manager)
 
 
@@ -168,6 +173,7 @@ async def resume_sync_clock(
     except ValueError as e:
         raise HTTPException(status_code=404, detail=str(e))
     manager.resume(clock_id)
+    fire_entity_event("sync_clock", "updated", clock_id)
     return _to_response(clock, manager)
 
 
@@ -184,4 +190,5 @@ async def reset_sync_clock(
     except ValueError as e:
         raise HTTPException(status_code=404, detail=str(e))
     manager.reset(clock_id)
+    fire_entity_event("sync_clock", "updated", clock_id)
     return _to_response(clock, manager)