add domain concepts: FillStrategy variants, Chapter, InterstitialRule, MidRollRule, gap_filler

- FillStrategy: +Alternating (round-robin series), +Weighted (fresh-first), +Marathon (always ep1, loops)
- Chapter value object on MediaItem (JSON column in library_items)
- InterstitialRule + MidRollRule on ProgrammingBlock (data model only)
- gap_filler: Option<MediaFilter> on Channel (persisted as JSON column)
- migration: 20260712000002_add_chapters_and_gap_filler.sql

crates/application/src/library/tests/search.rs

@@ -42,6 +42,7 @@ fn seed_items_with_genres(repo: &std::sync::Arc<domain::testing::InMemoryLibrary
         thumbnail_url: None,
         synced_at: Some("2026-01-01".into()),
         role: MediaRole::default(),
+        chapters: Vec::new(),
     });
     let scifi = MediaItem::from_persistence(MediaItemRow {
         id: MediaItemId::new("test::m2"),
@@ -63,6 +64,7 @@ fn seed_items_with_genres(repo: &std::sync::Arc<domain::testing::InMemoryLibrary
         thumbnail_url: None,
         synced_at: Some("2026-01-01".into()),
         role: MediaRole::default(),
+        chapters: Vec::new(),
     });
     let comedy = MediaItem::from_persistence(MediaItemRow {
         id: MediaItemId::new("test::m3"),
@@ -84,6 +86,7 @@ fn seed_items_with_genres(repo: &std::sync::Arc<domain::testing::InMemoryLibrary
         thumbnail_url: None,
         synced_at: Some("2026-01-01".into()),
         role: MediaRole::default(),
+        chapters: Vec::new(),
     });
 
     store.insert(action.id().value().to_string(), action);