feat(cli): add Install Command Line Tool via Settings, menu, and Command Palette
Adds the ability to install the `prowl` CLI from within the app:
- CLIInstallClient dependency for symlink-based install/uninstall
- Settings > Advanced: CLI install status + install/uninstall button
- Prowl menu: "Install Command Line Tool..." item
- Command Palette: "Install Command Line Tool" item
- Makefile targets: build-cli-release, embed-cli
- Xcode project: prowl-cli resource bundling
- Tests for CLIInstallClient and AppFeature reducer
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