**Related issue:** Resolves#45353
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements), JS
inline code is prevented especially for url redirects, and untrusted
data interpolated into shell scripts/commands is validated against shell
metacharacters.
## Testing
- [x] Added/updated automated tests
- [ ] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Release Notes
* **New Features**
* Added support for `$FLEET_VAR_HOST_*` variables in Android managed app
configurations, including host UUID, hardware serial, platform, and
end-user IdP details.
* **Improvements**
* Android app configurations are now validated to reject unsupported
Fleet variables.
* Fleet variables are substituted with real per-host values during
Android app configuration deployment, including batch/GitOps and
host-specific workflows.
* **Tests**
* Added unit and integration coverage for supported/unsupported
variables, substitution behavior, and JSON escaping.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Konstantin Sykulev
ead9d40293