feat: Implement document upload and verification workflow by expanding document statuses, adding verification metadata, and introducing a mandatory flag for documents.

backend/dataconnect/schema/document.gql

@@ -14,6 +14,7 @@ type Document @table(name: "documents") {
   name: String!
   description: String
   documentType: DocumentType! 
+  isMandatory: Boolean @default(expr: "false")
   createdAt: Timestamp @default(expr: "request.time")
   updatedAt: Timestamp @default(expr: "request.time")
   createdBy: String

backend/dataconnect/schema/staffDocument.gql

@@ -1,6 +1,13 @@
 enum DocumentStatus {
-  UPLOADED
   PENDING
+  PROCESSING
+  AUTO_PASS
+  AUTO_FAIL
+  NEEDS_REVIEW
+  APPROVED
+  REJECTED
+  ERROR
+  UPLOADED
   EXPIRING
   MISSING
   VERIFIED
@@ -12,9 +19,16 @@ type StaffDocument @table(name: "staff_documents", key: ["staffId", "documentId"
   staffName: String!
   documentId: UUID!
   document: Document! @ref(fields: "documentId", references: "id")
-  status: DocumentStatus!
+  
+  status: DocumentStatus! @default(expr: "'PENDING'")
   documentUrl: String
   expiryDate: Timestamp
+
+  # Verification Metadata (Align with Attire flow)
+  verificationId: String
+  verifiedAt: Timestamp
+  rejectionReason: String
+
   createdAt: Timestamp @default(expr: "request.time")
   updatedAt: Timestamp @default(expr: "request.time")
   createdBy: String