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/output_targets.py

@@ -65,6 +65,7 @@ class OutputTargetCreate(BaseModel):
     picture_source_id: str = Field(default="", description="Picture source ID (for key_colors targets)")
     key_colors_settings: Optional[KeyColorsSettingsSchema] = Field(None, description="Key colors settings (for key_colors targets)")
     description: Optional[str] = Field(None, description="Optional description", max_length=500)
+    tags: List[str] = Field(default_factory=list, description="User-defined tags")
 
 
 class OutputTargetUpdate(BaseModel):
@@ -85,6 +86,7 @@ class OutputTargetUpdate(BaseModel):
     picture_source_id: Optional[str] = Field(None, description="Picture source ID (for key_colors targets)")
     key_colors_settings: Optional[KeyColorsSettingsSchema] = Field(None, description="Key colors settings (for key_colors targets)")
     description: Optional[str] = Field(None, description="Optional description", max_length=500)
+    tags: Optional[List[str]] = None
 
 
 class OutputTargetResponse(BaseModel):
@@ -107,6 +109,7 @@ class OutputTargetResponse(BaseModel):
     picture_source_id: str = Field(default="", description="Picture source ID (key_colors)")
     key_colors_settings: Optional[KeyColorsSettingsSchema] = Field(None, description="Key colors settings")
     description: Optional[str] = Field(None, description="Description")
+    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")