feat: Update document download logic to use id as a fallback for the S3 key and refine the VerificationDocument interface.

src/services/users.service.ts

@@ -11,7 +11,8 @@ export interface AgentType {
 }
 
 export interface VerificationDocument {
-  key: string;
+  id?: string;  // S3 key is stored in id field from upload service
+  key?: string; // Alternative S3 key field
   name: string;
   size: number;
   type: string;