feat(validation): introduce express-validator on CMS user and article endpoints

Replaces the broken fieldValidation helper (called next() without return,
so execution continued on invalid input) with express-validator chains
applied at the route level. Validation covers: email format, username
constraints, password min length, field lengths, URL and phone formats.
products and tags controllers retain their local fieldValidation pending
a separate ecommerce validation pass.

src/routes/api/cms/users.routes.js

@@ -5,6 +5,8 @@ const {
     updateUser, updateUserEmail, updateUserPassword, updateUserRole, updateUserUsername
 } = require('../../../controllers/users.controller');
 const auth = require('../../../middlewares/auth');
+const validate = require('../../../middlewares/validate');
+const { createUserRules, loginRules, updateUserRules, updateEmailRules, updateUsernameRules, updateRoleRules } = require('../../../middlewares/validators/users.validators');
 
 const userRouter = express.Router();
 
@@ -17,15 +19,15 @@ const authLimiter = rateLimit({
 });
 
 userRouter.get('/', auth.required, getUser);
-userRouter.put('/', auth.required, updateUser);
-userRouter.post('/', authLimiter, auth.optional, createUser);
+userRouter.put('/', auth.required, updateUserRules, validate, updateUser);
+userRouter.post('/', authLimiter, auth.optional, createUserRules, validate, createUser);
 userRouter.get('/authenticate', auth.optional, authenticate);
-userRouter.post('/login', authLimiter, auth.optional, loginAsUser);
+userRouter.post('/login', authLimiter, auth.optional, loginRules, validate, loginAsUser);
 //userRouter.post('/register', auth.optional, createUser);
 //userRouter.get('/users', auth.required, getAllUsers);
-userRouter.put('/update/email', auth.required, updateUserEmail);
+userRouter.put('/update/email', auth.required, updateEmailRules, validate, updateUserEmail);
 userRouter.put('/update/password', auth.required, updateUserPassword);
-userRouter.put('/update/role', auth.required, updateUserRole);
-userRouter.put('/update/username', auth.required, updateUserUsername);
+userRouter.put('/update/role', auth.required, updateRoleRules, validate, updateUserRole);
+userRouter.put('/update/username', auth.required, updateUsernameRules, validate, updateUserUsername);
 
 module.exports = userRouter;