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/worker/Cargo.toml

@@ -17,6 +17,7 @@ local-files = ["dep:adapter-local-files"]
 domain = { workspace = true }
 application = { workspace = true }
 infra-wiring = { workspace = true }
+adapter-common = { workspace = true }
 adapter-sqlite = { workspace = true, optional = true }
 adapter-auth = { workspace = true }
 adapter-jellyfin = { workspace = true, optional = true }