Add privilege management system with related migrations and guards

- Introduced a new `PrivilegesModule` to manage user privileges and access control.
- Added `RequirePrivilege` decorator to enforce privilege checks on controller handlers.
- Implemented `PrivilegesGuard` to handle authorization based on user privileges.
- Created database migrations for `privileges`, `privilege_keys`, and `privilege_details` tables.
- Updated user model to include `is_superadmin` field for enhanced access control.
- Added unit tests for the new privileges functionality and guards to ensure correct behavior.

package.json

@@ -57,6 +57,7 @@
     "@types/bcrypt": "^6.0.0",
     "@types/express": "^5.0.0",
     "@types/jest": "^30.0.0",
+    "@types/multer": "^2.2.0",
     "@types/node": "^24.0.0",
     "@types/passport-jwt": "^4.0.1",
     "@types/supertest": "^7.0.0",