restructure: move proxmox/ into subfolder, add pihole/ section

All existing content moved from repo root into proxmox/ to make room
for other Debian machine configs. Adds pihole/ with:

- config/pihole.toml — snapshot of current Pi-hole v6 config
- config/dnsmasq.d/99-ipxe-chainload.conf — custom PXE DHCP rules
  (EFI/BIOS iPXE chainload, fixed tag-specificity bug for UEFI boot)
- pull-config.sh <source-host> <dest-dir> — pull live config to disk
- apply-config.sh <source-dir> <dest-host> — push config to a Pi-hole

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XRzqNDrbnYR22ZgZj1Bg3s

pihole/pull-config.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Pull Pi-hole configuration from a running instance to a local directory.
+#
+# Usage: pull-config.sh <source-host> <dest-dir>
+#   source-host  SSH-reachable hostname or IP of the source Pi-hole
+#   dest-dir     Local directory to write config into (created if absent)
+#
+# Example:
+#   ./pull-config.sh root@pihole ./config
+#   ./pull-config.sh root@192.168.2.100 /backup/pihole-$(date +%Y%m%d)
+
+set -euo pipefail
+
+usage() {
+  echo "Usage: $(basename "$0") <source-host> <dest-dir>" >&2
+  echo "  source-host  SSH target for the source Pi-hole (e.g. root@pihole)" >&2
+  echo "  dest-dir     Local directory to write config files into" >&2
+  exit 1
+}
+
+[[ $# -eq 2 ]] || usage
+
+SOURCE="$1"
+DEST="$2"
+
+echo "Pulling Pi-hole config from ${SOURCE} → ${DEST}"
+
+mkdir -p "${DEST}/dnsmasq.d"
+
+# ── pihole.toml ────────────────────────────────────────────────────────────────
+echo "  pihole.toml"
+ssh "${SOURCE}" "cat /etc/pihole/pihole.toml" > "${DEST}/pihole.toml"
+
+# ── custom dnsmasq drop-ins ────────────────────────────────────────────────────
+# Pi-hole manages its own generated config; we only capture user-added files.
+echo "  dnsmasq.d/ (custom drop-ins)"
+ssh "${SOURCE}" "ls /etc/dnsmasq.d/*.conf 2>/dev/null || true" | while read -r f; do
+  name="$(basename "$f")"
+  echo "    ${name}"
+  ssh "${SOURCE}" "cat '${f}'" > "${DEST}/dnsmasq.d/${name}"
+done
+
+# ── DHCP static leases ─────────────────────────────────────────────────────────
+echo "  dhcp.leases"
+ssh "${SOURCE}" "cat /etc/pihole/dhcp.leases 2>/dev/null || true" > "${DEST}/dhcp.leases"
+
+echo "Done. Config written to ${DEST}/"