feat: Implement full certificate management with upload, upsert, delete, and new domain models for staff certificates and their statuses.

apps/mobile/packages/core/lib/src/routing/staff/route_paths.dart

@@ -172,6 +172,9 @@ class StaffPaths {
   /// Manage professional certificates (e.g., food handling, CPR, etc.).
   static const String certificates = '/worker-main/certificates/';
 
+  /// Certificate upload page.
+  static const String certificateUpload = '/worker-main/certificates/upload/';
+
   // ==========================================================================
   // FINANCIAL INFORMATION
   // ==========================================================================

apps/mobile/packages/core/lib/src/services/api_service/core_api_services/verification/verification_service.dart

@@ -17,6 +17,7 @@ class VerificationService extends BaseCoreService {
     required String subjectType,
     required String subjectId,
     required String fileUri,
+    String? category,
     Map<String, dynamic>? rules,
   }) async {
     final ApiResponse res = await action(() async {
@@ -27,6 +28,7 @@ class VerificationService extends BaseCoreService {
           'subjectType': subjectType,
           'subjectId': subjectId,
           'fileUri': fileUri,
+          if (category != null) 'category': category,
           if (rules != null) 'rules': rules,
         },
       );