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/system.py

@@ -7,7 +7,7 @@ import platform
 import subprocess
 import sys
 import threading
-from datetime import datetime
+from datetime import datetime, timezone
 from pathlib import Path
 from typing import Optional
 
@@ -18,7 +18,23 @@ from pydantic import BaseModel
 
 from wled_controller import __version__
 from wled_controller.api.auth import AuthRequired
-from wled_controller.api.dependencies import get_auto_backup_engine, get_processor_manager
+from wled_controller.api.dependencies import (
+    get_auto_backup_engine,
+    get_audio_source_store,
+    get_audio_template_store,
+    get_automation_store,
+    get_color_strip_store,
+    get_device_store,
+    get_output_target_store,
+    get_pattern_template_store,
+    get_picture_source_store,
+    get_pp_template_store,
+    get_processor_manager,
+    get_scene_preset_store,
+    get_sync_clock_store,
+    get_template_store,
+    get_value_source_store,
+)
 from wled_controller.api.schemas.system import (
     AutoBackupSettings,
     AutoBackupStatusResponse,
@@ -104,7 +120,7 @@ async def health_check():
 
     return HealthResponse(
         status="healthy",
-        timestamp=datetime.utcnow(),
+        timestamp=datetime.now(timezone.utc),
         version=__version__,
     )
 
@@ -124,6 +140,39 @@ async def get_version():
     )
 
 
+@router.get("/api/v1/tags", tags=["Tags"])
+async def list_all_tags(_: AuthRequired):
+    """Get all tags used across all entities."""
+    all_tags: set[str] = set()
+    store_getters = [
+        get_device_store, get_output_target_store, get_color_strip_store,
+        get_picture_source_store, get_audio_source_store, get_value_source_store,
+        get_sync_clock_store, get_automation_store, get_scene_preset_store,
+        get_template_store, get_audio_template_store, get_pp_template_store,
+        get_pattern_template_store,
+    ]
+    for getter in store_getters:
+        try:
+            store = getter()
+        except RuntimeError:
+            continue
+        # Each store has a different "get all" method name
+        items = None
+        for method_name in (
+            "get_all_devices", "get_all_targets", "get_all_sources",
+            "get_all_streams", "get_all_clocks", "get_all_automations",
+            "get_all_presets", "get_all_templates",
+        ):
+            fn = getattr(store, method_name, None)
+            if fn is not None:
+                items = fn()
+                break
+        if items:
+            for item in items:
+                all_tags.update(getattr(item, 'tags', []))
+    return {"tags": sorted(all_tags)}
+
+
 @router.get("/api/v1/config/displays", response_model=DisplayListResponse, tags=["Config"])
 async def get_displays(
     _: AuthRequired,
@@ -238,7 +287,7 @@ def get_system_performance(_: AuthRequired):
         ram_total_mb=round(mem.total / 1024 / 1024, 1),
         ram_percent=mem.percent,
         gpu=gpu,
-        timestamp=datetime.utcnow(),
+        timestamp=datetime.now(timezone.utc),
     )
 
 
@@ -318,14 +367,14 @@ def backup_config(_: AuthRequired):
             "format": "ledgrab-backup",
             "format_version": 1,
             "app_version": __version__,
-            "created_at": datetime.utcnow().isoformat() + "Z",
+            "created_at": datetime.now(timezone.utc).isoformat() + "Z",
             "store_count": len(stores),
         },
         "stores": stores,
     }
 
     content = json.dumps(backup, indent=2, ensure_ascii=False)
-    timestamp = datetime.utcnow().strftime("%Y-%m-%dT%H%M%S")
+    timestamp = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H%M%S")
     filename = f"ledgrab-backup-{timestamp}.json"
 
     return StreamingResponse(