Moves `iklimco-net` overlay network creation to be managed by the Docker Swarm stack, ensuring reliable embedded DNS resolution for inter-service communication. This resolves issues where services on external overlay networks failed to discover each other via Docker DNS.
This refactoring includes:
* Removing the manual `iklimco-net` creation from the Ansible `swarm` role.
* Adjusting `act_runner` configuration to connect job containers to `iklimco-net` only after the stack has deployed and created the network.
* Setting `storagebox_file_mode` to `0600` for DB nodes to prevent "too open" errors with MongoDB keyfiles.
* Provisioning dedicated bind mount directories for MongoDB and PostgreSQL on DB nodes with correct ownership and permissions.
* Updating documentation to reflect the consolidated stack and network changes.