treewide: better cross-device sync capabilities; in-database storage

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Id99798df6f7e4470caae8a193c2654aa6a6a6964

crates/pinakes-core/src/import.rs

@@ -195,6 +195,12 @@ pub async fn import_file_with_options(
         rating: extracted.rating,
         perceptual_hash,
 
+        // Managed storage fields - external files use defaults
+        storage_mode: StorageMode::External,
+        original_filename: None,
+        uploaded_at: None,
+        storage_key: None,
+
         created_at: now,
         updated_at: now,
     };