docs: add CLAUDE.md

Author: bakerboy448

CLAUDE.md

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+# Scripts
+
+General-purpose utility scripts for selfhosted infrastructure.
+
+## Key Scripts
+- `nextdns_sync.py` — Syncs NextDNS configuration
+- `.bash_aliases` — Shared shell aliases
+- `sysrestart` — System restart utility
+
+## Legacy (may be deprecated)
+- `syncaliases.sh` — Alias sync (replaced by dockergit)
+- `PiHoleInstall.txt` / `PiHoleOS.txt` — Pi-hole setup notes
+- `server-xfer.md` — Server transfer documentation
+
+## Conventions
+- Bash scripts: POSIX-compatible where possible
+- Python scripts: Use system python or project venv