first commit

backend/src/routes/tariff.routes.ts

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+import { Router } from 'express';
+import * as tariffController from '../controllers/tariff.controller.js';
+import { authenticate, requirePermission } from '../middleware/auth.js';
+
+const router = Router();
+
+// Standalone tariff routes (for update/delete by tariff id)
+router.get('/:id', authenticate, tariffController.getTariff);
+router.put('/:id', authenticate, requirePermission('providers:update'), tariffController.updateTariff);
+router.delete('/:id', authenticate, requirePermission('providers:delete'), tariffController.deleteTariff);
+
+export default router;