add maintenance mode

internal/httpapp/routes.go

@@ -34,6 +34,24 @@ func (a *App) routes() {
 		nil, nil, nil,
 	))
 
+	// Maintenance Mode (requires authentication, admin-only for enable/disable)
+	a.mux.HandleFunc("/api/v1/maintenance", methodHandler(
+		func(w http.ResponseWriter, r *http.Request) { a.handleGetMaintenanceStatus(w, r) },
+		func(w http.ResponseWriter, r *http.Request) {
+			adminRole := models.RoleAdministrator
+			a.requireRole(adminRole)(http.HandlerFunc(a.handleEnableMaintenance)).ServeHTTP(w, r)
+		},
+		nil, nil, nil,
+	))
+	a.mux.HandleFunc("/api/v1/maintenance/disable", methodHandler(
+		nil,
+		func(w http.ResponseWriter, r *http.Request) {
+			adminRole := models.RoleAdministrator
+			a.requireRole(adminRole)(http.HandlerFunc(a.handleDisableMaintenance)).ServeHTTP(w, r)
+		},
+		nil, nil, nil,
+	))
+
 	// API Documentation
 	a.mux.HandleFunc("/api/docs", a.handleAPIDocs)
 	a.mux.HandleFunc("/api/openapi.yaml", a.handleOpenAPISpec)