feat: support multiple dotfiles repos

[alexcatdad]

Summary

Add support for managing multiple dotfiles repositories (e.g., work + personal).

Use Case

Some users have separate dotfiles for work and personal machines, or want to layer configs (personal on top of company baseline).

Proposed API

paw init work https://github.com/company/dotfiles
paw init personal https://github.com/me/dotfiles
paw sync work           # Sync specific repo
paw install personal    # Install from specific repo
paw list                # Show all configured repos

Implementation Notes

• Config would move from single repo path to a map of named repos
• Need to handle conflicts when layering configs
• Consider priority/ordering for overlapping symlinks

Priority

Future enhancement - current single-repo model works for most users.

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Created during repo separation planning