feat: Add NFO UI features (Task 6)

- Extended AnimeSummary model with NFO fields (has_nfo, nfo_created_at, nfo_updated_at, tmdb_id, tvdb_id)
- Updated list_anime endpoint to fetch and return NFO data from database
- Added NFO status badges to series cards (green=exists, gray=missing)
- Created nfo-manager.js module with createNFO, refreshNFO, viewNFO operations
- Added NFO action buttons to series cards (Create/View/Refresh)
- Integrated WebSocket handlers for real-time NFO events (creating, completed, failed)
- Added CSS styles for NFO badges and action buttons
- All 34 NFO API tests passing, all 32 anime endpoint tests passing
- Documented in docs/task6_status.md (90% complete, NFO status page deferred)

src/server/web/static/css/components/cards.css

@@ -75,6 +75,7 @@
   right: var(--spacing-sm);
   display: flex;
   align-items: center;
+  gap: var(--spacing-xs);
 }
 
 .status-missing {
@@ -87,6 +88,40 @@
   font-size: 1.2em;
 }
 
+/* NFO Status Badge */
+.nfo-badge {
+  font-size: 1em;
+  margin-left: var(--spacing-xs);
+}
+
+.nfo-badge.nfo-exists {
+  color: var(--color-success);
+}
+
+.nfo-badge.nfo-missing {
+  color: var(--color-text-tertiary);
+  opacity: 0.5;
+}
+
+/* Series Card Actions */
+.series-actions {
+  display: flex;
+  gap: var(--spacing-xs);
+  margin-top: var(--spacing-sm);
+  padding-top: var(--spacing-sm);
+  border-top: 1px solid var(--color-border);
+}
+
+.series-actions .btn {
+  flex: 1;
+  font-size: var(--font-size-caption);
+  padding: var(--spacing-xs) var(--spacing-sm);
+}
+
+.series-actions .btn i {
+  margin-right: var(--spacing-xs);
+}
+
 /* Series Card States */
 .series-card.has-missing {
   border-left: 4px solid var(--color-warning);