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/value_sources.py

@@ -51,6 +51,7 @@ def _to_response(source: ValueSource) -> ValueSourceResponse:
         picture_source_id=d.get("picture_source_id"),
         scene_behavior=d.get("scene_behavior"),
         description=d.get("description"),
+        tags=d.get("tags", []),
         created_at=source.created_at,
         updated_at=source.updated_at,
     )
@@ -97,6 +98,7 @@ async def create_value_source(
             picture_source_id=data.picture_source_id,
             scene_behavior=data.scene_behavior,
             auto_gain=data.auto_gain,
+            tags=data.tags,
         )
         return _to_response(source)
     except ValueError as e:
@@ -144,6 +146,7 @@ async def update_value_source(
             picture_source_id=data.picture_source_id,
             scene_behavior=data.scene_behavior,
             auto_gain=data.auto_gain,
+            tags=data.tags,
         )
         # Hot-reload running value streams
         pm.update_value_source(source_id)