Initial commit: CinemaTrailers4Jellyfins plugin

Adapted from Trailers4Jellyfin: keeps TMDB/YouTube trailer downloading,
the scheduled task, language/source/date filters, and trailer rotation,
but drops cinema-mode/IIntroProvider entirely. Each trailer now ships in
its own fake-movie folder (placeholder video + locked NFO + trailer) for
use with a Cinema Mode / trailer pre-roll plugin.

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Configuration/PluginConfiguration.cs

@@ -0,0 +1,42 @@
+using MediaBrowser.Model.Plugins;
+
+namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins.Configuration
+{
+    public class PluginConfiguration : BasePluginConfiguration
+    {
+        // ── TMDB ──────────────────────────────────────────────────────────────
+
+        public string TmdbApiKey { get; set; } = string.Empty;
+
+        // ── Sources ───────────────────────────────────────────────────────────
+
+        public bool SourceNowPlaying { get; set; } = true;
+        public bool SourceUpcoming { get; set; } = true;
+        public bool SourcePopular { get; set; } = false;
+        public bool SourceTopRated { get; set; } = false;
+
+        // ── Date Range ────────────────────────────────────────────────────────
+
+        public int ReleaseDateRangeMonths { get; set; } = 6;
+
+        // ── Download Settings ─────────────────────────────────────────────────
+
+        public string DownloadFolder { get; set; } = string.Empty;
+        public int MaxTrailersToDownload { get; set; } = 20;
+        public int MaxPagesPerSource { get; set; } = 3;
+        public int PreferredVideoHeight { get; set; } = 720;
+        public bool SkipAlreadyDownloaded { get; set; } = true;
+        public bool SkipMoviesInLibrary { get; set; } = true;
+        public string YtDlpPath { get; set; } = string.Empty;
+
+        // ── Languages ─────────────────────────────────────────────────────────
+
+        /// <summary>Comma-separated ISO 639-1 codes. Empty = all languages allowed.</summary>
+        public string AllowedLanguages { get; set; } = string.Empty;
+
+        // ── Trailer Rotation ──────────────────────────────────────────────────
+
+        /// <summary>Maximum trailers to keep on disk. Oldest are deleted first when exceeded. 0 = unlimited.</summary>
+        public int MaxTotalTrailers { get; set; } = 50;
+    }
+}