Support app updates for non-Play Android builds

[linroid]

Android APKs distributed outside Google Play currently have no in-app update flow. Add direct and play distribution flavors: the direct build offers GitHub updates in Settings → About, while Play builds leave updates to Google Play and exclude the updater dependency, installation permission, activity, and file provider.

The direct updater reuses release discovery and SHA-256 verification, validates the APK's package, release version, and increasing version code, and opens Android's permission screen and package installer only after the user chooses to install. It supports automatic checks, progress, retries, and activity recreation. The GitHub release workflow now builds assembleDirectRelease under the existing asset name; Play uses bundlePlayRelease.

Validation:

• 17 Android updater/validation tests and 33 shared updater tests passed.
• Both debug APKs, the minified direct release APK, and the Play release bundle built successfully; release vital lint passed.
• Inspected packaged manifests to verify the updater permission and components appear only in direct builds, including after shrinking.
• A signed on-device upgrade, including permission denial and installer cancellation, still needs manual smoke testing.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-06T10:57:14.986039Z	46ce066	PR opened

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[github-actions]

Test Results

 1 392 files  + 2   1 419 suites  +2   10m 58s ⏱️ +22s
 9 143 tests +18   8 914 ✅ +18  229 💤 ±0  0 ❌ ±0 
10 482 runs  +18  10 253 ✅ +18  229 💤 ±0  0 ❌ ±0 

Results for commit e91127f. ± Comparison against base commit 0a6a9c8.