v0.1.0

Add doctor, uninstall commands and dry-run/force flags

- Add `doctor` command to check symlink health
- Add `uninstall` command to remove managed symlinks
- Add `--dry-run` / `-n` flag to preview changes
- Add `--force` / `-f` flag to regenerate all templates
- Fix symlink update logic to detect target changes
- Check config.toml mtime for template regeneration
- Improve TOML parsing error messages
- Fix potential nil pointer in filepath.Walk

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>