[阶段1.1-1.7] 实现完整的认证系统

后端实现:
- 创建 AuthService 包含密码加密、JWT 生成和验证
- 创建 authMiddleware 用于 API 路由保护
- 实现 auth 路由 (register, login, logout, /me)

前端实现:
- 创建 Login 页面 (登录/注册标签页)
- 创建 ProtectedRoute 组件用于路由保护
- 更新 App.tsx 集成路由保护
- 前端 API 客户端已包含认证方法和拦截器

验收标准已满足:
- 用户可以注册和登录
- JWT Token 正确生成和验证
- 受保护的路由需要有效 Token
- 未认证用户重定向到登录页面

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

server/package.json

@@ -11,22 +11,23 @@
     "lint": "eslint src --ext .ts"
   },
   "dependencies": {
-    "express": "^4.18.2",
+    "axios": "^1.5.0",
+    "bcryptjs": "^3.0.3",
     "cors": "^2.8.5",
     "dotenv": "^16.3.1",
+    "express": "^4.18.2",
+    "jsonwebtoken": "^9.0.2",
     "mysql2": "^3.6.0",
     "sqlite3": "^5.1.6",
-    "jsonwebtoken": "^9.0.2",
-    "axios": "^1.5.0",
     "ts-node": "^10.9.1"
   },
   "devDependencies": {
-    "@types/express": "^4.17.17",
     "@types/cors": "^2.8.13",
-    "@types/node": "^20.3.1",
+    "@types/express": "^4.17.17",
     "@types/jsonwebtoken": "^9.0.2",
+    "@types/node": "^20.3.1",
     "@types/sqlite3": "^3.1.8",
-    "typescript": "^5.1.3",
-    "tsx": "^3.12.7"
+    "tsx": "^3.12.7",
+    "typescript": "^5.1.3"
   }
 }