Add tags to all entity types with chip-based input and autocomplete

- Add `tags: List[str]` field to all 13 entity types (devices, output targets,
  CSS sources, picture sources, audio sources, value sources, sync clocks,
  automations, scene presets, capture/audio/PP/pattern templates)
- Update all stores, schemas, and route handlers for tag CRUD
- Add GET /api/v1/tags endpoint aggregating unique tags across all stores
- Create TagInput component with chip display, autocomplete dropdown,
  keyboard navigation, and API-backed suggestions
- Display tag chips on all entity cards (searchable via existing text filter)
- Add tag input to all 14 editor modals with dirty check support
- Add CSS styles and i18n keys (en/ru/zh) for tag UI
- Also includes code review fixes: thread safety, perf, store dedup

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

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

@@ -33,6 +33,7 @@ def _to_response(clock: SyncClock, manager: SyncClockManager) -> SyncClockRespon
         name=clock.name,
         speed=rt.speed if rt else clock.speed,
         description=clock.description,
+        tags=getattr(clock, 'tags', []),
         is_running=rt.is_running if rt else True,
         elapsed_time=rt.get_time() if rt else 0.0,
         created_at=clock.created_at,
@@ -67,6 +68,7 @@ async def create_sync_clock(
             name=data.name,
             speed=data.speed,
             description=data.description,
+            tags=data.tags,
         )
         return _to_response(clock, manager)
     except ValueError as e:
@@ -103,6 +105,7 @@ async def update_sync_clock(
             name=data.name,
             speed=data.speed,
             description=data.description,
+            tags=data.tags,
         )
         # Hot-update runtime speed
         if data.speed is not None: