MediaRole auto-detection + manual role API + sync wiring (#7)

role_detector: classify items as Interstitial by collection name/tag patterns.
Wire chapter extraction + role detection into sync adapter (worker + presentation).
SQLite: persist/read role column, migration.
PUT /library/items/{id}/role endpoint for manual override.

crates/domain/src/ports/library.rs

@@ -5,7 +5,7 @@ use crate::models::{
     LibraryCollection, LibrarySyncLogEntry, LibrarySyncResult, MediaItem,
     SeasonSummary, ShowSummary,
 };
-use crate::value_objects::{ContentType, LibrarySearchFilter};
+use crate::value_objects::{ContentType, LibrarySearchFilter, MediaRole};
 
 use super::media::IMediaProvider;
 
@@ -18,6 +18,8 @@ pub trait LibraryCommand: Send + Sync {
     async fn log_sync_start(&self, provider_id: &str) -> DomainResult<i64>;
 
     async fn log_sync_finish(&self, log_id: i64, result: &LibrarySyncResult) -> DomainResult<()>;
+
+    async fn update_role(&self, item_id: &str, role: MediaRole) -> DomainResult<()>;
 }
 
 #[async_trait]

crates/domain/src/testing/in_memory.rs

@@ -418,6 +418,18 @@ impl LibraryCommand for InMemoryLibraryRepository {
         Ok(id)
     }
 
+    async fn update_role(&self, item_id: &str, role: crate::value_objects::MediaRole) -> DomainResult<()> {
+        let mut store = self.items.lock().unwrap();
+        if let Some(item) = store.get_mut(item_id) {
+            item.set_role(role);
+            Ok(())
+        } else {
+            Err(crate::errors::DomainError::NotFound(format!(
+                "Library item {item_id} not found"
+            )))
+        }
+    }
+
     async fn log_sync_finish(&self, log_id: i64, result: &LibrarySyncResult) -> DomainResult<()> {
         let mut logs = self.sync_logs.lock().unwrap();
         if let Some(entry) = logs.iter_mut().find(|e| e.id() == log_id) {