Add bootstrap.sh and rewrite README for modular system
bootstrap.sh: one curl | sudo bash to get and run on a fresh box — installs git if missing, clones/updates the repo, execs setup.sh. README.md: complete rewrite. The old README described the monolithic script (--restore, --migrate flags, Samba, NetBird, etc.) which no longer exists. New README covers quick start, usage modes, service table, layout, and managing installed services. https://claude.ai/code/session_01Y4dMKtkqkpvmgDKoRdzhTG
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