<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#36670
Refactoring `middleware/endpoint_utils` package to remove direct
dependencies on:
- fleet.Service
- android.Service
Specific changes are:
- replace AuthFunc+FleetService with AuthMiddleware
- Move the definition of handler functions to the respective services
and use a generic `CommonEndpointer[H any] struct`
Although this was discovered as part of Activity bounded context
research, this change is not directly related to bounded contexts.
In retrospect, this decoupling should have been done when creating the
Android service for ADR-0001.
## Testing
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Internal restructuring of endpoint handling and authentication
middleware composition to improve code maintainability and type safety.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
For #32788.
## Testing
- [X] Added/updated automated tests
- [X] QA'd all new/changed functionality manually
## fleetd/orbit/Fleet Desktop
- [X] Verified compatibility with the latest released version of Fleet
(see [Must
rule](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/workflows/fleetd-development-and-release-strategy.md))
- [X] If the change applies to only one platform, confirmed that
`runtime.GOOS` is used as needed to isolate changes
- [x] Verified that fleetd runs on macOS, Linux and Windows
- [X] Verified auto-update works from the released version of component
to the new version (see [tools/tuf/test](../tools/tuf/test/README.md))
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- New Features
- Enhanced Linux setup experience: persists status on disk, resumes
automatically, and completes when software/scripts finish.
- Opens the “My Device” page only when desktop is enabled, using a
user-aware launcher on Linux.
- Linux setup status now focuses on software progress for faster,
clearer feedback.
- Bug Fixes
- Corrected auth/MDM checks: macOS requires Apple MDM; Linux no longer
blocked by MDM configuration on shared endpoints.
- Improved reliability and logging around software installation and
temporary directory cleanup.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
