Fix Flutter Dependency Conflicts

Short summary

Use FVM (Flutter Version Manager) to resolve SDK version conflicts by managing multiple Flutter versions per-project. Install globally, configure per-project, and prefix Flutter commands with `fvm` to ensure correct SDK usage and avoid dependency resolution errors.

• •FVM manages multiple Flutter SDK versions to prevent dependency conflicts
• •Install and set per-project, then prefix commands with `fvm` to use locked version
• •Eliminates 'version solving failed' errors from mismatched SDK versions

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