feat(api): add /v1/maintenance policies and run endpoints

OpenAPI, httpapi CRUD/run/dry-run, job maintenance_policy_run и audit с policy_id.

Co-authored-by: Cursor <[email protected]>

internal/httpapi/routes.go

@@ -78,6 +78,7 @@ func (s *Server) registerV1(m *http.ServeMux) {
 	s.registerCRUDRoutes(m)
 	s.registerPostgresMonitoringRoutes(m)
 	s.registerPostgresMaintenanceRoutes(m)
+	s.registerMaintenanceRoutes(m)
 }
 
 func (s *Server) handleHealth(w http.ResponseWriter, r *http.Request) {