Adds .gitea/workflows/ota-release.yml: triggered on esp32-balance/vX.Y.Z
or esp32-io/vX.Y.Z tags, builds the corresponding ESP32-S3 project with
espressif/idf:v5.2.2, and attaches <app>_<version>.bin + .sha256 to the
Gitea release for OTA download.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
