Update Environment_Infrastructure to match the current root stack conventions for database images, shared secret names, and APISIX real IP handling.
- update test Ansible DB image defaults to PostGIS 18/PostGIS 3.6 and MongoDB 8.3.2
- align Patroni configuration with DATABASE_POSTGRES_* secret variable names
- document APISIX real IP template configuration and Harbor rebuild workflow
- replace the separate DB stack env file guidance with the shared .env.secrets.shared flow
- update production setup and roadmap snippets to use current PostGIS, MongoDB, and APISIX rebuild commands
- Refactor production setup documentation to reflect a 3-node Vault Raft cluster starting from launch.
- Update all paths to use StorageBox mounts for shared state (SWAG config, TLS certs, Monitoring data).
- Switch Nginx configuration convention from proxy-confs to site-confs to align with SWAG's auto-include behavior.
- Standardize TLS private key extensions to .pem.
- Update node failover and recovery facts to include monitoring services.
- Align deployment pipeline instructions with the latest environment variable-driven approach.
