feat: serve derivative files via GET /assets/{id}/derivatives/{profile}

- ReadDerivativeHandler queries DerivativeRepository + FileStoragePort
- Profile URL param: thumbnail, thumbnail_large, web_optimized, video_sd
- Immutable cache headers (derivatives don't change once generated)
- Wired into bootstrap catalog service builder

crates/bootstrap/src/services/catalog.rs

@@ -1,13 +1,13 @@
 use std::sync::Arc;
 
 use adapters_postgres::{
-    PgPool, PostgresAssetMetadataRepository, PostgresAssetRepository, PostgresDuplicateRepository,
-    PostgresIngestTransaction,
+    PgPool, PostgresAssetMetadataRepository, PostgresAssetRepository, PostgresDerivativeRepository,
+    PostgresDuplicateRepository, PostgresIngestTransaction,
 };
 use adapters_storage::LocalFileStorage;
 use application::catalog::{
-    GetAssetHandler, GetTimelineHandler, ReadAssetFileHandler, RegisterAssetHandler,
-    UpdateMetadataHandler,
+    GetAssetHandler, GetTimelineHandler, ReadAssetFileHandler, ReadDerivativeHandler,
+    RegisterAssetHandler, UpdateMetadataHandler,
 };
 use application::storage::IngestAssetHandler;
 use domain::ports::EventPublisher;
@@ -23,6 +23,7 @@ pub fn build(
 ) -> CatalogHandlers {
     let asset_repo = Arc::new(PostgresAssetRepository::new(pool.clone()));
     let metadata_repo = Arc::new(PostgresAssetMetadataRepository::new(pool.clone()));
+    let derivative_repo = Arc::new(PostgresDerivativeRepository::new(pool.clone()));
     let duplicate_repo = Arc::new(PostgresDuplicateRepository::new(pool.clone()));
     let ingest_tx = Arc::new(PostgresIngestTransaction::new(pool.clone()));
 
@@ -49,7 +50,12 @@ pub fn build(
         event_publisher.clone(),
     ));
 
-    let read_asset_file = Arc::new(ReadAssetFileHandler::new(asset_repo.clone(), file_storage));
+    let read_asset_file = Arc::new(ReadAssetFileHandler::new(
+        asset_repo.clone(),
+        file_storage.clone(),
+    ));
+
+    let read_derivative = Arc::new(ReadDerivativeHandler::new(derivative_repo, file_storage));
 
     let register_asset = Arc::new(RegisterAssetHandler::new(
         asset_repo,
@@ -63,6 +69,7 @@ pub fn build(
         get_timeline,
         update_metadata,
         read_asset_file,
+        read_derivative,
         register_asset,
     }
 }