refactor(naming): harmonize controller and route file names

- Delete product.controller.js, merge unique functions into products.controller.js
- Rename user.controller.js → users.controller.js, user.routes.js → users.routes.js
- Remove dead herowars/herowars.routes.js reference from herowars index
- Update all import paths accordingly

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

@@ -0,0 +1,22 @@
+const express = require('express');
+const {
+    authenticate, createUser, getUser, loginAsUser,
+    updateUser, updateUserEmail, updateUserPassword, updateUserRole, updateUserUsername
+} = require('../../../controllers/users.controller');
+const auth = require('../../../middlewares/auth');
+
+const userRouter = express.Router();
+
+userRouter.get('/', auth.required, getUser);
+userRouter.put('/', auth.required, updateUser);
+userRouter.post('/', auth.optional, createUser);
+userRouter.get('/authenticate', auth.optional, authenticate);
+userRouter.post('/login', auth.optional, loginAsUser);
+//userRouter.post('/register', auth.optional, createUser);
+//userRouter.get('/users', auth.required, getAllUsers);
+userRouter.put('/update/email', auth.required, updateUserEmail);
+userRouter.put('/update/password', auth.required, updateUserPassword);
+userRouter.put('/update/role', auth.required, updateUserRole);
+userRouter.put('/update/username', auth.required, updateUserUsername);
+
+module.exports = userRouter;