Switch update checks to GitHub releases

[GT-610]

Summary by CodeRabbit

• New Features

  • Update checks now use separate sources for release information and the app store, improving how version updates are found and opened.
  • Added clearer app and GitHub release links for update-related actions.

• Chores

  • Updated an embedded library reference to a newer revision.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 71508937-9aca-42a1-aed9-12e97014faa0

📥 Commits

Reviewing files that changed from the base of the PR and between 1f6ee0b and 2a16644.

📒 Files selected for processing (4)

• lib/data/res/url.dart
• lib/view/page/home.dart
• lib/view/page/setting/entries/app.dart
• packages/fl_lib

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📝 Walkthrough

Walkthrough

Urls.updateCfg is removed and replaced with three new constants: githubApi, githubReleasesApi, and appStore. Both AppUpdateIface.doUpdate call sites—in _HomePageState.afterFirstLayout and _buildCheckUpdate—are updated to pass githubReleasesUrl: Urls.githubReleasesApi and storeUrl: Urls.appStore instead of the former single url argument. The packages/fl_lib submodule is advanced to a new commit.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: update checks now use GitHub releases instead of the old update config.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/github-release-update-source

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