fix: 修复云端变量记录data为null的问题

- 后端: handleAddRecord增加recordData nil检查,避免存入null
- 后端: 记录读取改用interface{}替代map[string]interface{}解析JSON
- 后端: JSON解析失败时回退返回原始字符串
- 后端: API返回raw_data字段暴露数据库原始数据用于诊断
- 后端: app/cloud.go同步修复同样的JSON解析问题
- 前端: parseRecordData增加raw_data回退解析
- 前端: 添加数据诊断卡片显示原始数据结构

backend/internal/router/app/cloud.go

@@ -818,11 +818,16 @@ func handleAppGetVariableRecords(c *gin.Context) {
 
 	result := make([]gin.H, len(records))
 	for i, r := range records {
-		var data map[string]interface{}
-		json.Unmarshal([]byte(r.Data), &data)
+		var parsedData interface{}
+		if r.Data != "" {
+			json.Unmarshal([]byte(r.Data), &parsedData)
+		}
+		if parsedData == nil && r.Data != "" {
+			parsedData = r.Data
+		}
 		result[i] = gin.H{
 			"id":         r.ID,
-			"data":       data,
+			"data":       parsedData,
 			"created_at": r.CreatedAt,
 		}
 	}

backend/internal/router/app/dynamic.go

@@ -592,6 +592,9 @@ func handleAddRecord(appID uint, userID *uint, actionMap map[string]interface{})
 	if !ok {
 		return fmt.Errorf("缺少record_data参数")
 	}
+	if recordData == nil {
+		return fmt.Errorf("record_data不能为空")
+	}
 
 	var variable model.CloudVariable
 	if err := database.DB.Where("app_id = ? AND key = ?", appID, variableKey).First(&variable).Error; err != nil {
@@ -684,13 +687,17 @@ func getRecords(appID uint, userID *uint, variableKey string, page, pageSize int
 	var recordList []interface{}
 	for _, record := range records {
 		var data interface{}
-		if err := json.Unmarshal([]byte(record.Data), &data); err == nil {
-			recordList = append(recordList, map[string]interface{}{
-				"id":         record.ID,
-				"data":       data,
-				"created_at": record.CreatedAt,
-			})
+		if record.Data != "" {
+			json.Unmarshal([]byte(record.Data), &data)
 		}
+		if data == nil && record.Data != "" {
+			data = record.Data
+		}
+		recordList = append(recordList, map[string]interface{}{
+			"id":         record.ID,
+			"data":       data,
+			"created_at": record.CreatedAt,
+		})
 	}
 
 	result["success"] = true