I wanted to run Home Assistant without adding a dedicated host (Raspberry Pi, NUC, VM, etc.), using existing network infrastructure instead.
This resulted in a small container-based setup running directly on a container-capable network router (e.g. MikroTik, Teltonika). Home Assistant runs in a container and is used as a generic integration layer, with a lightweight bridge handling communication with external systems (Loxone is one concrete use case).
The approach is generic and can be adapted for other integrations as well. It focuses on running HA in containers with minimal footprint and without additional hardware.
Documentation and example setup: