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/templates.py

@@ -62,7 +62,7 @@ async def list_templates(
                 name=t.name,
                 engine_type=t.engine_type,
                 engine_config=t.engine_config,
-
+                tags=getattr(t, 'tags', []),
                 created_at=t.created_at,
                 updated_at=t.updated_at,
                 description=t.description,
@@ -93,6 +93,7 @@ async def create_template(
             engine_type=template_data.engine_type,
             engine_config=template_data.engine_config,
             description=template_data.description,
+            tags=template_data.tags,
         )
 
         return TemplateResponse(
@@ -100,7 +101,7 @@ async def create_template(
             name=template.name,
             engine_type=template.engine_type,
             engine_config=template.engine_config,
-
+            tags=getattr(template, 'tags', []),
             created_at=template.created_at,
             updated_at=template.updated_at,
             description=template.description,
@@ -130,6 +131,7 @@ async def get_template(
         name=template.name,
         engine_type=template.engine_type,
         engine_config=template.engine_config,
+        tags=getattr(template, 'tags', []),
         created_at=template.created_at,
         updated_at=template.updated_at,
         description=template.description,
@@ -151,6 +153,7 @@ async def update_template(
             engine_type=update_data.engine_type,
             engine_config=update_data.engine_config,
             description=update_data.description,
+            tags=update_data.tags,
         )
 
         return TemplateResponse(
@@ -158,7 +161,7 @@ async def update_template(
             name=template.name,
             engine_type=template.engine_type,
             engine_config=template.engine_config,
-
+            tags=getattr(template, 'tags', []),
             created_at=template.created_at,
             updated_at=template.updated_at,
             description=template.description,