fix:bug

src/server.ts

@@ -22,7 +22,8 @@ const accessLogPath = path.join(logDir, 'node-access.log');
 const accessLogStream = fs.createWriteStream(accessLogPath, { flags: 'a' });
 
 app.use(cors());
-app.use(express.json());
+// 提高 JSON 体积上限，便于传输图片 base64（默认 100kb 太小）
+app.use(express.json({ limit: '20mb' }));
 app.use(morgan('dev'));
 app.use(morgan('combined', { stream: accessLogStream }));