docs: align Dart SDK documentation

[jonathannorris]

Summary

• Align Flutter platform requirements and package version guidance with the current plugin.
• Add initialization readiness handling to the getting-started example.

Validation

• git diff --check passed

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[Copilot]

Pull request overview

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Updates the Flutter SDK documentation to reflect newer SDK/version requirements and adds an initialization callback example to the getting started guide.

Changes:

• Updated minimum platform requirements text (Flutter/Dart, iOS, Android).
• Bumped the documented devcycle_flutter_client_sdk version in installation instructions.
• Added an onInitialized usage example in initState().

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
docs/sdk/client-side-sdks/flutter/flutter-install.md	Updates stated platform requirements and the dependency version shown in install docs.
docs/sdk/client-side-sdks/flutter/flutter-gettingstarted.md	Adds a sample onInitialized callback to help users gate evaluations on first config.

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[JamieSinn]

Same comment here - can we automate this?

[jonathannorris]

yea I'm going to look into how to do that across the SDKs, but that's for another PR