feat(sync): full code sync from release

backend/internal/handler/gateway_helper.go

@@ -18,12 +18,17 @@ import (
 // claudeCodeValidator is a singleton validator for Claude Code client detection
 var claudeCodeValidator = service.NewClaudeCodeValidator()
 
+const claudeCodeParsedRequestContextKey = "claude_code_parsed_request"
+
 // SetClaudeCodeClientContext 检查请求是否来自 Claude Code 客户端，并设置到 context 中
 // 返回更新后的 context
-func SetClaudeCodeClientContext(c *gin.Context, body []byte) {
+func SetClaudeCodeClientContext(c *gin.Context, body []byte, parsedReq *service.ParsedRequest) {
 	if c == nil || c.Request == nil {
 		return
 	}
+	if parsedReq != nil {
+		c.Set(claudeCodeParsedRequestContextKey, parsedReq)
+	}
 	// Fast path：非 Claude CLI UA 直接判定 false，避免热路径二次 JSON 反序列化。
 	if !claudeCodeValidator.ValidateUserAgent(c.GetHeader("User-Agent")) {
 		ctx := service.SetClaudeCodeClient(c.Request.Context(), false)
@@ -37,8 +42,11 @@ func SetClaudeCodeClientContext(c *gin.Context, body []byte) {
 		isClaudeCode = true
 	} else {
 		// 仅在确认为 Claude CLI 且 messages 路径时再做 body 解析。
-		var bodyMap map[string]any
-		if len(body) > 0 {
+		bodyMap := claudeCodeBodyMapFromParsedRequest(parsedReq)
+		if bodyMap == nil {
+			bodyMap = claudeCodeBodyMapFromContextCache(c)
+		}
+		if bodyMap == nil && len(body) > 0 {
 			_ = json.Unmarshal(body, &bodyMap)
 		}
 		isClaudeCode = claudeCodeValidator.Validate(c.Request, bodyMap)
@@ -49,6 +57,42 @@ func SetClaudeCodeClientContext(c *gin.Context, body []byte) {
 	c.Request = c.Request.WithContext(ctx)
 }
 
+func claudeCodeBodyMapFromParsedRequest(parsedReq *service.ParsedRequest) map[string]any {
+	if parsedReq == nil {
+		return nil
+	}
+	bodyMap := map[string]any{
+		"model": parsedReq.Model,
+	}
+	if parsedReq.System != nil || parsedReq.HasSystem {
+		bodyMap["system"] = parsedReq.System
+	}
+	if parsedReq.MetadataUserID != "" {
+		bodyMap["metadata"] = map[string]any{"user_id": parsedReq.MetadataUserID}
+	}
+	return bodyMap
+}
+
+func claudeCodeBodyMapFromContextCache(c *gin.Context) map[string]any {
+	if c == nil {
+		return nil
+	}
+	if cached, ok := c.Get(service.OpenAIParsedRequestBodyKey); ok {
+		if bodyMap, ok := cached.(map[string]any); ok {
+			return bodyMap
+		}
+	}
+	if cached, ok := c.Get(claudeCodeParsedRequestContextKey); ok {
+		switch v := cached.(type) {
+		case *service.ParsedRequest:
+			return claudeCodeBodyMapFromParsedRequest(v)
+		case service.ParsedRequest:
+			return claudeCodeBodyMapFromParsedRequest(&v)
+		}
+	}
+	return nil
+}
+
 // 并发槽位等待相关常量
 //
 // 性能优化说明：