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/sync_clocks.py

@@ -12,6 +12,7 @@ class SyncClockCreate(BaseModel):
     name: str = Field(description="Clock name", min_length=1, max_length=100)
     speed: float = Field(default=1.0, description="Speed multiplier (0.1–10.0)", ge=0.1, le=10.0)
     description: Optional[str] = Field(None, description="Optional description", max_length=500)
+    tags: List[str] = Field(default_factory=list, description="User-defined tags")
 
 
 class SyncClockUpdate(BaseModel):
@@ -20,6 +21,7 @@ class SyncClockUpdate(BaseModel):
     name: Optional[str] = Field(None, description="Clock name", min_length=1, max_length=100)
     speed: Optional[float] = Field(None, description="Speed multiplier (0.1–10.0)", ge=0.1, le=10.0)
     description: Optional[str] = Field(None, description="Optional description", max_length=500)
+    tags: Optional[List[str]] = None
 
 
 class SyncClockResponse(BaseModel):
@@ -29,6 +31,7 @@ class SyncClockResponse(BaseModel):
     name: str = Field(description="Clock name")
     speed: float = Field(description="Speed multiplier")
     description: Optional[str] = Field(None, description="Description")
+    tags: List[str] = Field(default_factory=list, description="User-defined tags")
     is_running: bool = Field(True, description="Whether clock is currently running")
     elapsed_time: float = Field(0.0, description="Current elapsed time in seconds")
     created_at: datetime = Field(description="Creation timestamp")