first commit

backend/src/routes/auth.routes.js

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+import Router from 'koa-router';
+import { login, callback, logout, getUser } from '../controllers/auth.controller.js';
+import { authMiddleware } from '../middleware/auth.js';
+
+const router = new Router({ prefix: '/api/auth' });
+
+// 公开路由
+router.post('/login', login);
+router.get('/callback', callback);
+router.post('/logout', logout);
+
+// 需要认证的路由
+router.get('/user', authMiddleware, getUser);
+
+export default router;