optimize pg_rto_plan parameters

v4.0.0-c1, the first release candidate

feat(pgsql): add pg-drop-role script for safe user deletion

- Add /pg/bin/pg-drop-role script to safely drop PostgreSQL roles
- Handle all dependencies: databases, tablespaces, schemas, tables, ACLs
- Transfer ownership to successor role (default: pg_dbsu)
- Terminate active connections with --force flag
- Create audit log before deletion for recovery reference
- Protect system roles: postgres, replicator, dbuser_dba, dbuser_monitor
- Support --check (read-only) and --dry-run modes

Update pgsql user.yml to use pg-drop-role instead of simple DROP ROLE,
which previously failed when role had dependent objects.

add the new playbook deploy.yml

refactor the simu config template with 20 nodes

bump grafana config to 12.3.0

add el10 stub to aliyun terraform template

update install asciinema video