refactor: 重构项目结构，迁移后端至 mengyastore-backend-go，新增 Java 后端、前端功能更新及部署文档

mengyastore-backend-go/internal/auth/sproutgate.go

@@ -0,0 +1,66 @@
+package auth
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"time"
+)
+
+const defaultAuthAPIURL = "https://auth.api.shumengya.top"
+
+type SproutGateClient struct {
+	apiURL     string
+	httpClient *http.Client
+}
+
+type VerifyResult struct {
+	Valid bool            `json:"valid"`
+	User  *SproutGateUser `json:"user"`
+}
+
+type SproutGateUser struct {
+	Account   string `json:"account"`
+	Username  string `json:"username"`
+	AvatarURL string `json:"avatarUrl"`
+	Level     int    `json:"level"`
+	Email     string `json:"email"`
+}
+
+func NewSproutGateClient(apiURL string) *SproutGateClient {
+	if apiURL == "" {
+		apiURL = defaultAuthAPIURL
+	}
+	return &SproutGateClient{
+		apiURL:     apiURL,
+		httpClient: &http.Client{Timeout: 10 * time.Second},
+	}
+}
+
+func (c *SproutGateClient) VerifyToken(token string) (*VerifyResult, error) {
+	body, _ := json.Marshal(map[string]string{"token": token})
+	resp, err := c.httpClient.Post(c.apiURL+"/api/auth/verify", "application/json", bytes.NewReader(body))
+	if err != nil {
+		log.Printf("[SproutGate] 验证请求失败: %v", err)
+		return nil, fmt.Errorf("验证请求失败: %w", err)
+	}
+	defer resp.Body.Close()
+
+	rawBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Printf("[SproutGate] 读取响应体失败: %v", err)
+		return nil, fmt.Errorf("读取验证响应失败: %w", err)
+	}
+
+	log.Printf("[SproutGate] verify response status=%d body=%s", resp.StatusCode, string(rawBody))
+
+	var result VerifyResult
+	if err := json.Unmarshal(rawBody, &result); err != nil {
+		log.Printf("[SproutGate] 解析响应失败: %v", err)
+		return nil, fmt.Errorf("解析验证响应失败: %w", err)
+	}
+	return &result, nil
+}