docs: 更新API测试文件，添加WebSocket和认证相关端点

src/CellularManagement.WebAPI/CellularManagement.WebAPI.http

@@ -1,6 +1,36 @@
 @CellularManagement.WebAPI_HostAddress = http://localhost:5202
+@WebSocket_HostAddress = ws://localhost:5202
 
+### 获取天气预测
 GET {{CellularManagement.WebAPI_HostAddress}}/weatherforecast/
 Accept: application/json
 
-###
+### 用户认证
+# @name login
+POST {{CellularManagement.WebAPI_HostAddress}}/api/auth/login
+Content-Type: application/json
+
+{
+    "username": "admin",
+    "password": "admin123"
+}
+
+### 获取用户信息
+GET {{CellularManagement.WebAPI_HostAddress}}/api/users/me
+Authorization: Bearer {{login.response.body.token}}
+
+### WebSocket连接测试
+# 使用WebSocket客户端工具连接
+# 连接地址: {{WebSocket_HostAddress}}/ws
+
+### 发送WebSocket消息
+# 使用WebSocket客户端工具发送消息
+# 消息格式: {"type": "message", "content": "Hello, WebSocket!"}
+
+### 获取系统状态
+GET {{CellularManagement.WebAPI_HostAddress}}/api/system/status
+Authorization: Bearer {{login.response.body.token}}
+
+### 获取WebSocket连接统计
+GET {{CellularManagement.WebAPI_HostAddress}}/api/websocket/stats
+Authorization: Bearer {{login.response.body.token}}