统一角色体系为admin/agent/user，修复代理查询角色错误，添加语言切换和明暗切换

backend/internal/router/developer/cloud.go

@@ -419,8 +419,8 @@ func handleCreateCloudVariable(c *gin.Context) {
 		req.Scope = "app"
 	}
 
-	if req.WritePermission != "developer" && req.WritePermission != "user" && req.WritePermission != "app_user" {
-		req.WritePermission = "developer"
+	if req.WritePermission != "admin" && req.WritePermission != "user" && req.WritePermission != "app_user" {
+		req.WritePermission = "admin"
 	}
 
 	if req.Status != "active" && req.Status != "inactive" {
@@ -489,7 +489,7 @@ func handleUpdateCloudVariable(c *gin.Context) {
 		variable.DataType = req.DataType
 	}
 	variable.MaxRecords = req.MaxRecords
-	if req.WritePermission == "developer" || req.WritePermission == "user" || req.WritePermission == "app_user" {
+	if req.WritePermission == "admin" || req.WritePermission == "user" || req.WritePermission == "app_user" {
 		variable.WritePermission = req.WritePermission
 	}
 	variable.Description = req.Description
@@ -571,8 +571,8 @@ func handleUploadCloudVariable(c *gin.Context) {
 		scope = "app"
 	}
 
-	if writePermission != "developer" && writePermission != "user" {
-		writePermission = "developer"
+	if writePermission != "admin" && writePermission != "user" {
+		writePermission = "admin"
 	}
 
 	var user model.User