Merge pull request #2202 from Michael-Jetson/main

新增三大功能：兑换码邀请返利、批量修改用户并发数、Markdown页面渲染

backend/internal/server/routes/admin.go

@@ -245,6 +245,7 @@ func registerUserManagementRoutes(admin *gin.RouterGroup, h *handler.Handlers) {
 		users.GET("/:id/balance-history", h.Admin.User.GetBalanceHistory)
 		users.POST("/:id/replace-group", h.Admin.User.ReplaceGroup)
 		users.GET("/:id/rpm-status", h.Admin.User.GetUserRPMStatus)
+		users.POST("/batch-concurrency", h.Admin.User.BatchUpdateConcurrency)
 
 		// User attribute values
 		users.GET("/:id/attributes", h.Admin.UserAttribute.GetUserAttributes)