重构后端API和配置，新增仪表板数据接口并优化本地开发环境配置

backend/package.json

@@ -46,16 +46,18 @@
     "morgan": "^1.10.0",
     "multer": "^1.4.5-lts.1",
     "mysql2": "^3.14.3",
+    "nodemailer": "^7.0.6",
+    "pm2": "^5.3.0",
     "redis": "^5.8.2",
+    "sharp": "^0.34.4",
     "swagger-jsdoc": "^6.2.8",
     "swagger-ui-express": "^5.0.1",
     "winston": "^3.11.0",
-    "xss-clean": "^0.1.4",
-    "pm2": "^5.3.0"
+    "xss-clean": "^0.1.4"
   },
   "devDependencies": {
     "eslint": "^8.56.0",
     "jest": "^29.7.0",
     "nodemon": "^3.1.10"
   }
-}
+}