feat: Implement CodexAuth proxy pool management with a new frontend configuration page and a dedicated backend service for API, database, and proxy testing.

backend/internal/proxyutil/test_proxy.go

@@ -0,0 +1,77 @@
+package proxyutil
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"time"
+)
+
+// ProxyTestResult 代理测试结果
+type ProxyTestResult struct {
+	Success  bool   `json:"success"`
+	Location string `json:"location"`
+	IP       string `json:"ip"`
+	Error    string `json:"error,omitempty"`
+}
+
+// IPApiResponse ip-api.com 响应结构
+type IPApiResponse struct {
+	Status      string `json:"status"`
+	Country     string `json:"country"`
+	CountryCode string `json:"countryCode"`
+	Region      string `json:"region"`
+	RegionName  string `json:"regionName"`
+	City        string `json:"city"`
+	Query       string `json:"query"`
+	Message     string `json:"message"`
+}
+
+// TestProxy 测试代理连通性并获取归属地
+func TestProxy(proxyURL string) (*ProxyTestResult, error) {
+	normalized, err := Normalize(proxyURL)
+	if err != nil {
+		return nil, fmt.Errorf("代理地址格式错误: %w", err)
+	}
+
+	// 解析代理 URL
+	parsedProxy, err := url.Parse(normalized)
+	if err != nil {
+		return nil, fmt.Errorf("解析代理错误: %w", err)
+	}
+
+	// 创建带代理的客户端
+	client := &http.Client{
+		Transport: &http.Transport{
+			Proxy: http.ProxyURL(parsedProxy),
+		},
+		Timeout: 15 * time.Second,
+	}
+
+	// 请求 IP 查询接口
+	resp, err := client.Get("http://ip-api.com/json/")
+	if err != nil {
+		return &ProxyTestResult{Success: false, Error: err.Error()}, nil
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return &ProxyTestResult{Success: false, Error: fmt.Sprintf("HTTP %d", resp.StatusCode)}, nil
+	}
+
+	var ipInfo IPApiResponse
+	if err := json.NewDecoder(resp.Body).Decode(&ipInfo); err != nil {
+		return &ProxyTestResult{Success: false, Error: "解析响应失败: " + err.Error()}, nil
+	}
+
+	if ipInfo.Status != "success" {
+		return &ProxyTestResult{Success: false, Error: "查询失败: " + ipInfo.Message}, nil
+	}
+
+	return &ProxyTestResult{
+		Success:  true,
+		Location: ipInfo.CountryCode,
+		IP:       ipInfo.Query,
+	}, nil
+}