fix: 云端函数默认注入当前登录用户信息

- 当请求参数未指定 user_id 时，使用 token 中的用户 ID
- 确保 user、subscription、devices 等变量始终有值

backend/internal/router/app/dynamic.go

@@ -173,49 +173,52 @@ func handleExecuteDynamicCode(c *gin.Context) {
 	userVariables := map[string]interface{}{}
 	devices := []map[string]interface{}{}
 
+	targetUserID := claims.UserID
 	if req.UserID != nil {
-		var user model.AppUser
-		if err := database.DB.Where("id = ? AND application_id = ?", *req.UserID, app.ID).First(&user).Error; err == nil {
-			userData = map[string]interface{}{
-				"id":            user.ID,
-				"username":      user.Username,
-				"email":         user.Email,
-				"status":        user.Status,
-				"device_id":     user.DeviceID,
-				"avatar":        user.Avatar,
-				"created_at":    user.CreatedAt,
-				"last_login_at": user.LastLoginAt,
-			}
+		targetUserID = *req.UserID
+	}
 
-			subscription = map[string]interface{}{
-				"balance":       user.Balance,
-				"is_trial_user": user.IsTrialUser,
-				"trial_start_at": user.TrialStartAt,
-				"trial_end_at":  user.TrialEndAt,
-				"expiry_at":     user.ExpiryAt,
-				"is_expired":    user.ExpiryAt != nil && user.ExpiryAt.Before(time.Now()),
-				"is_lifetime":   user.Balance == -1,
-				"days_remaining": calculateDaysRemaining(user.ExpiryAt, user.Balance),
-			}
+	var user model.AppUser
+	if err := database.DB.Where("id = ? AND application_id = ?", targetUserID, app.ID).First(&user).Error; err == nil {
+		userData = map[string]interface{}{
+			"id":            user.ID,
+			"username":      user.Username,
+			"email":         user.Email,
+			"status":        user.Status,
+			"device_id":     user.DeviceID,
+			"avatar":        user.Avatar,
+			"created_at":    user.CreatedAt,
+			"last_login_at": user.LastLoginAt,
+		}
 
-			var userDevices []model.UserDevice
-			database.DB.Where("user_id = ? AND application_id = ?", user.ID, app.ID).Find(&userDevices)
-			for _, d := range userDevices {
-				devices = append(devices, map[string]interface{}{
-					"id":           d.ID,
-					"device_id":    d.DeviceID,
-					"device_name":  d.DeviceName,
-					"device_type":  d.DeviceType,
-					"status":       d.Status,
-					"created_at":   d.CreatedAt,
-				})
-			}
+		subscription = map[string]interface{}{
+			"balance":        user.Balance,
+			"is_trial_user":  user.IsTrialUser,
+			"trial_start_at": user.TrialStartAt,
+			"trial_end_at":   user.TrialEndAt,
+			"expiry_at":      user.ExpiryAt,
+			"is_expired":     user.ExpiryAt != nil && user.ExpiryAt.Before(time.Now()),
+			"is_lifetime":    user.Balance == -1,
+			"days_remaining": calculateDaysRemaining(user.ExpiryAt, user.Balance),
+		}
 
-			var userVars []model.UserVariable
-			database.DB.Where("user_id = ? AND app_id = ?", user.ID, app.ID).Find(&userVars)
-			for _, v := range userVars {
-				userVariables[v.VarName] = v.VarValue
-			}
+		var userDevices []model.UserDevice
+		database.DB.Where("user_id = ? AND application_id = ?", user.ID, app.ID).Find(&userDevices)
+		for _, d := range userDevices {
+			devices = append(devices, map[string]interface{}{
+				"id":           d.ID,
+				"device_id":    d.DeviceID,
+				"device_name":  d.DeviceName,
+				"device_type":  d.DeviceType,
+				"status":       d.Status,
+				"created_at":   d.CreatedAt,
+			})
+		}
+
+		var userVars []model.UserVariable
+		database.DB.Where("user_id = ? AND app_id = ?", user.ID, app.ID).Find(&userVars)
+		for _, v := range userVars {
+			userVariables[v.VarName] = v.VarValue
 		}
 	}