feat(content): add TV Series content type with TMDB integration

Add complete TV series content surface: extraction from AI responses,
grid/detail views, TMDB TV search endpoint, and panel tab integration.
Includes film_ext-to-TV-series conversion for backward compatibility
and AI prompt instructions for [[tv_ext:...]] tags.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/core/src/types/content.ts

@@ -78,6 +78,33 @@ export interface PodcastRendererData {
   totalResults?: number
 }
 
+export interface TVSeries {
+  id: string
+  title: string
+  year?: number
+  endYear?: number
+  posterUrl?: string
+  backdropUrl?: string
+  synopsis?: string
+  genres?: string[]
+  rating?: number
+  seasons?: number
+  episodes?: number
+  status?: 'ongoing' | 'ended' | 'cancelled' | 'upcoming'
+  network?: string
+  creator?: string
+  cast?: string[]
+  sources?: TVSeriesSource[]
+}
+
+export interface TVSeriesSource {
+  type: 'plex' | 'nextcloud' | 'youtube' | 'netflix' | 'free-web' | 'local'
+  name: string
+  url: string
+  quality?: string
+  icon?: string
+}
+
 export interface Book {
   id: string
   title: string