feat: add genre, rating, and avoid-repeats trailer filters

Trailer selection now supports three optional filters:
- Genre match: prefer trailers whose fake-movie genre overlaps with the
  feature being played (requires TMDB genres in NFO)
- Age rating ceiling: exclude trailers rated higher than the feature
  (requires TMDB certification in NFO)
- Avoid repeats: cycle through all trailers before replaying any;
  resets per-user once the pool is exhausted

Genre and certification are fetched from TMDB at download time via a
single /movie/{id}?append_to_response=release_dates call and written
into the fake-movie NFO as <genre> and <mpaa> tags. All filters fall
back to the full unfiltered pool when no match is found.

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

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Services/FakeMovieService.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.Threading;
@@ -55,7 +56,7 @@ namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins.Services
         /// Writes a minimal Jellyfin/Kodi-compatible movie NFO with <lockdata>true</lockdata>
         /// so Jellyfin never tries to refresh metadata for the fake entry from TMDB.
         /// </summary>
-        public void WriteNfo(string nfoPath, string title, int? year)
+        public void WriteNfo(string nfoPath, string title, int? year, IReadOnlyList<string>? genres = null, string? mpaa = null)
         {
             var settings = new XmlWriterSettings { Indent = true };
             using var writer = XmlWriter.Create(nfoPath, settings);
@@ -64,6 +65,11 @@ namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins.Services
             writer.WriteElementString("title", title);
             if (year.HasValue)
                 writer.WriteElementString("year", year.Value.ToString());
+            if (genres != null)
+                foreach (var genre in genres)
+                    writer.WriteElementString("genre", genre);
+            if (!string.IsNullOrWhiteSpace(mpaa))
+                writer.WriteElementString("mpaa", mpaa);
             writer.WriteElementString("lockdata", "true");
             writer.WriteEndElement();
             writer.WriteEndDocument();