refactor(api): remove internal metadata from image upload responses

Omit entity details, original filename, MIME type, and file size from payloads
Update backend SQL queries and frontend interfaces to align with design specs

frontend/src/services/api.ts

@@ -62,12 +62,6 @@ export interface EntityImage {
 
 export interface EntityImageUpload extends EntityImage {
   id: number;
-  entityType: ImageUploadEntityType;
-  entityId: number | null;
-  entityName: string;
-  originalFilename: string;
-  mimeType: string;
-  byteSize: number;
   uploadedAt: string;
   uploadedBy: UserSummary | null;
 }