fix: add pyenv shims to PATH on macOS (#813)

When Unity is launched from Dock/Spotlight on macOS, GUI applications
do not inherit the shell's PATH from .zshrc/.bashrc. This caused
MCP for Unity to fail finding Python installed via pyenv.

Add ~/.pyenv/shims to the augmented PATH in MacOSPlatformDetector
so Python can be found regardless of how Unity is launched.

Fixes #812

Co-authored-by: whatevertogo <whatevertogo@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: whatevertogo

MCPForUnity/Editor/Dependencies/PlatformDetectors/MacOSPlatformDetector.cs

@@ -188,6 +188,7 @@ private string[] GetPathAdditions()
             var homeDir = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
             return new[]
             {
+                Path.Combine(homeDir, ".pyenv", "shims"), // pyenv: Python/uv when Unity is launched from Dock/Spotlight
                 "/opt/homebrew/bin",
                 "/usr/local/bin",
                 "/usr/bin",