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/css/components.css

@@ -401,6 +401,119 @@ input:-webkit-autofill:focus {
     background: var(--info-color);
 }
 
+/* ── Card Tags ──────────────────────────────────────────── */
+
+.card-tags {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 4px;
+    margin-top: 6px;
+    margin-bottom: 4px;
+}
+
+.card-tag {
+    display: inline-block;
+    font-size: 0.68rem;
+    font-weight: 600;
+    color: var(--primary-color);
+    background: color-mix(in srgb, var(--primary-color) 12%, var(--bg-secondary));
+    border: 1px solid color-mix(in srgb, var(--primary-color) 25%, transparent);
+    padding: 1px 7px;
+    border-radius: 8px;
+    white-space: nowrap;
+    line-height: 1.4;
+}
+
+/* ── Tag Input (chip-based input with autocomplete) ──── */
+
+.tag-input-wrap {
+    position: relative;
+    display: flex;
+    flex-wrap: wrap;
+    align-items: center;
+    gap: 4px;
+    padding: 6px 8px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--bg-color);
+    cursor: text;
+    min-height: 38px;
+    transition: border-color 0.15s;
+}
+.tag-input-wrap:focus-within {
+    border-color: var(--primary-color);
+    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.15);
+}
+
+.tag-chip {
+    display: inline-flex;
+    align-items: center;
+    gap: 2px;
+    font-size: 0.8rem;
+    font-weight: 500;
+    color: var(--primary-color);
+    background: color-mix(in srgb, var(--primary-color) 12%, var(--bg-secondary));
+    border: 1px solid color-mix(in srgb, var(--primary-color) 25%, transparent);
+    padding: 2px 6px;
+    border-radius: 6px;
+    white-space: nowrap;
+    line-height: 1.3;
+}
+
+.tag-chip-remove {
+    background: none;
+    border: none;
+    color: inherit;
+    font-size: 0.9rem;
+    cursor: pointer;
+    padding: 0 2px;
+    line-height: 1;
+    opacity: 0.6;
+    transition: opacity 0.15s;
+}
+.tag-chip-remove:hover {
+    opacity: 1;
+}
+
+.tag-input-field {
+    flex: 1 1 60px;
+    min-width: 60px;
+    border: none !important;
+    outline: none !important;
+    background: none !important;
+    padding: 2px 0 !important;
+    font-size: 0.85rem;
+    color: var(--text-color);
+    box-shadow: none !important;
+}
+
+.tag-input-dropdown {
+    display: none;
+    position: absolute;
+    top: 100%;
+    left: 0;
+    right: 0;
+    z-index: 1000;
+    background: var(--bg-color);
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    box-shadow: 0 4px 12px var(--shadow-color);
+    margin-top: 4px;
+    max-height: 200px;
+    overflow-y: auto;
+}
+
+.tag-dropdown-item {
+    padding: 6px 10px;
+    font-size: 0.85rem;
+    cursor: pointer;
+    transition: background 0.1s;
+}
+.tag-dropdown-item:hover,
+.tag-dropdown-item.tag-dropdown-active {
+    background: var(--bg-secondary);
+}
+
 /* ── Focus-visible indicators for keyboard navigation ── */
 
 .btn:focus-visible,