fix: 订阅模式登录验证、永久会员类型区分、动态代码HTTP返回值修复、侧边栏滚动位置保持

- 修复订阅模式登录时错误检查余额的问题
- 区分无限余额和永久订阅两种永久会员类型
- 修复动态代码HTTP请求返回值在JS中无法正确访问的问题
- 添加侧边栏滚动位置保持功能
- 移除developer角色相关代码，统一使用admin
- 添加缺失的i18n翻译key

backend/internal/router/app/dynamic.go

@@ -250,19 +250,35 @@ func handleExecuteDynamicCode(c *gin.Context) {
 
 	httpClient := httputil.NewHTTPClient(10 * time.Second)
 	httpObj := map[string]interface{}{
-		"get": func(url string, headers map[string]interface{}) *httputil.HTTPResponse {
+		"get": func(url string, headers map[string]interface{}) map[string]interface{} {
 			convertedHeaders := make(map[string]string)
 			for k, v := range headers {
 				convertedHeaders[k] = fmt.Sprintf("%v", v)
 			}
-			return httpClient.Get(url, convertedHeaders)
+			resp := httpClient.Get(url, convertedHeaders)
+			return map[string]interface{}{
+				"statusCode": resp.StatusCode,
+				"status":     resp.Status,
+				"headers":    resp.Headers,
+				"body":       resp.Body,
+				"json":       resp.JSON,
+				"error":      resp.Error,
+			}
 		},
-		"post": func(url string, headers map[string]interface{}, body interface{}) *httputil.HTTPResponse {
+		"post": func(url string, headers map[string]interface{}, body interface{}) map[string]interface{} {
 			convertedHeaders := make(map[string]string)
 			for k, v := range headers {
 				convertedHeaders[k] = fmt.Sprintf("%v", v)
 			}
-			return httpClient.Post(url, convertedHeaders, body)
+			resp := httpClient.Post(url, convertedHeaders, body)
+			return map[string]interface{}{
+				"statusCode": resp.StatusCode,
+				"status":     resp.Status,
+				"headers":    resp.Headers,
+				"body":       resp.Body,
+				"json":       resp.JSON,
+				"error":      resp.Error,
+			}
 		},
 	}
 	if err := vm.Set("http", httpObj); err != nil {