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