feat(message-bus): add ping/keepalive on WS + root declaraiton on AsyncAPI

- plan also eviction in case of permison revoked

tests/common/server.env

@@ -35,6 +35,13 @@ OXICLOUD_OIDC_ENABLED=false
 
 OXICLOUD_NEXTCLOUD_ENABLED=true
 
+# Realtime WS keepalive interval (server-initiated protocol Ping).
+# Production default is 30 s; tests drop it to 1 s so the S5 scenario
+# in `tests/api/rt_bus_check.sh` can observe multiple keepalive frames
+# arriving within a bounded (few-seconds) wall-clock. Only observed
+# by `rt_ws_handler`, which reads it at each WS connect time.
+OXICLOUD_RT_WS_KEEPALIVE_SECONDS=1
+
 # Multi-entry storage config — see docs/plan/storage-multi-entry.md.
 # `local_main` is FIRST so the boot fallback picks it when no active
 # pointer is set in the DB yet (fresh test DB). Its root_dir falls