* 解决benchmark crash、add tests

* feat(mnnchat): commit android app and downloader updates

* chore(mnnchat): update jsonviewer dependency artifact

* refactor(mnnchat): remove manual executor scope from LlmSession::Load

* feat(mnnllmchat): merge MNN API compat and add API regression tests

* fix(mnnllmchat): back arrow button in SelectTextActivity now works (#4185)

The back arrow button was enabled but had no click handler.
Added onOptionsItemSelected() override to handle android.R.id.home
and call finish() to close the activity.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

* [MNN:Version] Update to 3.4.1.

Discussed-in: Merge-Request 26193851 , URL: https://code.alibaba-inc.com/AliNN/AliNNPrivate/codereview/26193851
GitOrigin-RevId: 9da7011c8d4ba35e3c710dbf085bf76a06939a0f

* fix(api/settings): unify 401 body path and dropdown init order

* fix(api-service): support runtime model switch and foreground start ordering

* chore(mnnllmchat): release 0.8.1 notes and version bump

* feat(mnnllmchat): update test and diffusion integration flows

* chore: restore root .gitignore to match origin/master

---------

Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: MNNSyncBot <hi@zhaode.wang>