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/audio_sources.py

@@ -43,6 +43,7 @@ def _to_response(source: AudioSource) -> AudioSourceResponse:
         audio_source_id=getattr(source, "audio_source_id", None),
         channel=getattr(source, "channel", None),
         description=source.description,
+        tags=getattr(source, 'tags', []),
         created_at=source.created_at,
         updated_at=source.updated_at,
     )
@@ -81,6 +82,7 @@ async def create_audio_source(
             channel=data.channel,
             description=data.description,
             audio_template_id=data.audio_template_id,
+            tags=data.tags,
         )
         return _to_response(source)
     except ValueError as e:
@@ -119,6 +121,7 @@ async def update_audio_source(
             channel=data.channel,
             description=data.description,
             audio_template_id=data.audio_template_id,
+            tags=data.tags,
         )
         return _to_response(source)
     except ValueError as e: