refactor: clean up presentation layer — AppState grouping, multipart extractor, thin handlers

crates/application/tests/catalog/queries/get_asset.rs

@@ -17,13 +17,7 @@ async fn returns_asset_with_resolved_metadata() {
         checksum: Checksum::new("a".repeat(64)).unwrap(),
     };
     let owner = SystemId::new();
-    let asset = Asset::new(
-        source,
-        AssetType::Image,
-        "image/jpeg",
-        1024,
-        owner,
-    );
+    let asset = Asset::new(source, AssetType::Image, "image/jpeg", 1024, owner);
     asset_repo.save(&asset).await.unwrap();
 
     // Add exif layer

crates/application/tests/storage/commands/ingest_asset.rs

@@ -77,7 +77,6 @@ impl Harness {
     }
 }
 
-
 #[tokio::test]
 async fn ingests_successfully() {
     let h = Harness::new();