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/static/js/features/device-discovery.js

@@ -7,6 +7,7 @@ import {
     _discoveryCache, set_discoveryCache,
 } from '../core/state.js';
 import { API_BASE, fetchWithAuth, isSerialDevice, isMockDevice, isMqttDevice, isWsDevice, isOpenrgbDevice, escapeHtml } from '../core/api.js';
+import { devicesCache } from '../core/state.js';
 import { t } from '../core/i18n.js';
 import { showToast } from '../core/ui.js';
 import { Modal } from '../core/modal.js';
@@ -463,6 +464,7 @@ export async function handleAddDevice(event) {
             const result = await response.json();
             console.log('Device added successfully:', result);
             showToast(t('device_discovery.added'), 'success');
+            devicesCache.invalidate();
             addDeviceModal.forceClose();
             if (typeof window.loadDevices === 'function') await window.loadDevices();
             if (!localStorage.getItem('deviceTutorialSeen')) {