Add managed Nginx HTTP-01 gateway activation and certificate status

backend/internal/api/api.go

@@ -306,6 +306,7 @@ func (s *Server) RegisterRoutes(r *gin.Engine) {
 		admin.GET("/system/tls/nginx-preview", s.nginxPreview)
 		admin.GET("/system/tls/nginx-setup", s.nginxSetupStatus)
 		admin.POST("/system/tls/nginx-setup", s.initializeNginx)
+		admin.POST("/system/tls/nginx-activate", s.activateNginx)
 		admin.GET("/users", s.listUsers)
 		admin.POST("/users", s.createUser)
 		admin.PUT("/users/:id", s.updateUser)