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/automations.py

@@ -107,6 +107,7 @@ def _automation_to_response(automation, engine: AutomationEngine, request: Reque
         is_active=state["is_active"],
         last_activated_at=state.get("last_activated_at"),
         last_deactivated_at=state.get("last_deactivated_at"),
+        tags=getattr(automation, 'tags', []),
         created_at=automation.created_at,
         updated_at=automation.updated_at,
     )
@@ -167,6 +168,7 @@ async def create_automation(
         scene_preset_id=data.scene_preset_id,
         deactivation_mode=data.deactivation_mode,
         deactivation_scene_preset_id=data.deactivation_scene_preset_id,
+        tags=data.tags,
     )
 
     if automation.enabled:
@@ -256,6 +258,7 @@ async def update_automation(
             condition_logic=data.condition_logic,
             conditions=conditions,
             deactivation_mode=data.deactivation_mode,
+            tags=data.tags,
         )
         if data.scene_preset_id is not None:
             update_kwargs["scene_preset_id"] = data.scene_preset_id