Fix API/frontend type mismatch for dashboard

- Backend: Change 'id' to 'artifact_id' in most_referenced_artifacts response
- Backend: Add content_type field to referenced artifacts
- Frontend: Add orphaned_size_bytes to Stats interface
- Frontend: Add missing fields to DeduplicationStats interface

backend/app/routes.py

@@ -2436,11 +2436,12 @@ def get_deduplication_stats(
 
     most_referenced = [
         {
-            "id": a.id,
+            "artifact_id": a.id,
             "ref_count": a.ref_count,
             "size": a.size,
             "storage_saved": a.size * (a.ref_count - 1),
             "original_name": a.original_name,
+            "content_type": a.content_type,
         }
         for a in top_artifacts
     ]

frontend/src/types.ts

@@ -168,6 +168,7 @@ export interface Stats {
   total_size_bytes: number;
   unique_artifacts: number;
   orphaned_artifacts: number;
+  orphaned_size_bytes: number;
   total_uploads: number;
   deduplicated_uploads: number;
   deduplication_ratio: number;
@@ -188,6 +189,11 @@ export interface DeduplicationStats {
   total_physical_bytes: number;
   bytes_saved: number;
   savings_percentage: number;
+  total_uploads: number;
+  unique_artifacts: number;
+  duplicate_uploads: number;
+  average_ref_count: number;
+  max_ref_count: number;
   most_referenced_artifacts: ReferencedArtifact[];
 }