Add Supervisor discovery metadata

mb_secure_bridge/DOCS.md

@@ -5,3 +5,8 @@ Configure the local controller address and the installation-specific credentials
 For local certificates, `fingerprint` mode requires the expected SHA-256 certificate fingerprint. A certificate change is rejected. `system_ca` uses the standard trust store, while `custom_ca` is reserved for a separately provided local certificate authority.
 
 The bridge API is intended for the internal Home Assistant network and is not exposed on a host port by default.
+
+When running under Home Assistant Supervisor, the app advertises and registers
+the local Bridge API through Supervisor discovery. The runtime-provided internal
+host name and the dedicated local bridge token are sent only to Supervisor. The
+integration asks for confirmation before creating a config entry.

mb_secure_bridge/config.yaml

@@ -10,6 +10,9 @@ arch:
   - amd64
   - aarch64
 image: git.bahmcloud.de/bahmcloud/mb-secure-bridge
+hassio_api: true
+discovery:
+  - mb_secure
 ports: {}
 ports_description: {}
 options: