chore: setup fvm

[pedroafmonteiro]

This pull request makes minor updates to Flutter version management across the workspace: if developers are on many projects using different flutter versions, this plugin helps them have a Project specific Flutter SDK. You can install this tool using: curl -fsSL https://fvm.app/install.sh | bash. if you proceed to use this plugin, all commands must be done with the fvm prefix (e.g. fvm flutter pub get).

Flutter version management updates:

• .fvmrc: Added a configuration file to specify the use of the stable Flutter channel for the project.
• packages/uni_app/pubspec.yaml: Updated the flutter environment constraint to allow any version greater than or equal to 3.41.0, improving flexibility and compatibility.
• packages/uni_ui/pubspec.yaml: Updated the flutter environment constraint in the same way as above, ensuring consistency across packages.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 7%. Comparing base (b33693e) to head (efe39c0).
⚠️ Report is 14 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1814   +/-   ##
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  Coverage        7%      7%           
=======================================
  Files           38      38           
  Lines         1842    1842           
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  Hits           125     125           
  Misses        1717    1717           

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[AugustoVSoares]

LGTM! 🔥 🚀

[HenriqueSFernandes]

I also updated the flake.nix to ensure we are always on the latest version.

[AugustoVSoares]

LGTM x2!