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/devices.py

@@ -18,6 +18,7 @@ class DeviceCreate(BaseModel):
     send_latency_ms: Optional[int] = Field(None, ge=0, le=5000, description="Simulated send latency in ms (mock devices)")
     rgbw: Optional[bool] = Field(None, description="RGBW mode (mock devices)")
     zone_mode: Optional[str] = Field(None, description="OpenRGB zone mode: combined or separate")
+    tags: List[str] = Field(default_factory=list, description="User-defined tags")
 
 
 class DeviceUpdate(BaseModel):
@@ -32,6 +33,7 @@ class DeviceUpdate(BaseModel):
     send_latency_ms: Optional[int] = Field(None, ge=0, le=5000, description="Simulated send latency in ms (mock devices)")
     rgbw: Optional[bool] = Field(None, description="RGBW mode (mock devices)")
     zone_mode: Optional[str] = Field(None, description="OpenRGB zone mode: combined or separate")
+    tags: Optional[List[str]] = None
 
 
 class CalibrationLineSchema(BaseModel):
@@ -125,6 +127,7 @@ class DeviceResponse(BaseModel):
     rgbw: bool = Field(default=False, description="RGBW mode (mock devices)")
     zone_mode: str = Field(default="combined", description="OpenRGB zone mode: combined or separate")
     capabilities: List[str] = Field(default_factory=list, description="Device type capabilities")
+    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")