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/api-types/src/lib.rs

@@ -20,7 +20,7 @@ pub use config::{ConfigResponse, ProviderCapabilitiesResponse, ProviderInfo};
 pub use iptv::IptvParams;
 pub use library::{
     CollectionResponse, GenresParams, LibraryItemResponse, LibrarySearchParams, ProviderParam,
-    SeasonResponse, SeasonsParams, ShowResponse, ShowsParams, SyncStatusEntry,
+    SeasonResponse, SeasonsParams, ShowResponse, ShowsParams, SyncStatusEntry, UpdateRoleRequest,
 };
 pub use providers::{ProviderConfigRequest, ProviderConfigResponse};
 pub use schedule::{

crates/api-types/src/library.rs

@@ -22,6 +22,7 @@ pub struct LibraryItemResponse {
     pub collection_type: Option<String>,
     pub thumbnail_url: Option<String>,
     pub synced_at: Option<String>,
+    pub role: String,
 }
 
 impl From<domain::MediaItem> for LibraryItemResponse {
@@ -44,6 +45,7 @@ impl From<domain::MediaItem> for LibraryItemResponse {
             collection_type: i.collection_type().map(|s| s.to_string()),
             thumbnail_url: i.thumbnail_url().map(|s| s.to_string()),
             synced_at: i.synced_at().map(|s| s.to_string()),
+            role: enum_to_string(i.role()),
         }
     }
 }
@@ -166,3 +168,8 @@ pub struct GenresParams {
     pub content_type: Option<String>,
     pub provider: Option<String>,
 }
+
+#[derive(Debug, Deserialize, ToSchema)]
+pub struct UpdateRoleRequest {
+    pub role: String,
+}