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/schemas/audio_templates.py

@@ -13,6 +13,7 @@ class AudioTemplateCreate(BaseModel):
     engine_type: str = Field(description="Audio engine type (e.g., 'wasapi', 'sounddevice')", min_length=1)
     engine_config: Dict = Field(default_factory=dict, description="Engine-specific configuration")
     description: Optional[str] = Field(None, description="Template description", max_length=500)
+    tags: List[str] = Field(default_factory=list, description="User-defined tags")
 
 
 class AudioTemplateUpdate(BaseModel):
@@ -22,6 +23,7 @@ class AudioTemplateUpdate(BaseModel):
     engine_type: Optional[str] = Field(None, description="Audio engine type")
     engine_config: Optional[Dict] = Field(None, description="Engine-specific configuration")
     description: Optional[str] = Field(None, description="Template description", max_length=500)
+    tags: Optional[List[str]] = None
 
 
 class AudioTemplateResponse(BaseModel):
@@ -31,6 +33,7 @@ class AudioTemplateResponse(BaseModel):
     name: str = Field(description="Template name")
     engine_type: str = Field(description="Engine type identifier")
     engine_config: Dict = Field(description="Engine-specific configuration")
+    tags: List[str] = Field(default_factory=list, description="User-defined tags")
     created_at: datetime = Field(description="Creation timestamp")
     updated_at: datetime = Field(description="Last update timestamp")
     description: Optional[str] = Field(None, description="Template description")