feat(httpapi): add local audit log with portal dual-write

Локальный audit_log (миграции pg/sqlite), GET /v1/audit, запись на CRUD и async push в auth-portal (source_app=bgp).

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/httpapi/routes.go

@@ -83,6 +83,7 @@ func (s *Server) registerV1(m *http.ServeMux) {
 	m.HandleFunc("GET /speakers/{speaker_id}/bundle/{revision_id}", s.handleNodeBundle)
 	m.HandleFunc("POST /nodes/enroll", s.handleNodeEnroll)
 	s.registerCRUDRoutes(m)
+	s.registerAuditRoutes(m)
 	s.registerPostgresMonitoringRoutes(m)
 	s.registerPostgresMaintenanceRoutes(m)
 	s.registerMaintenanceRoutes(m)