Initial commit: Headscale management scripts and configuration

- Add headscale binary and configuration files
- Include management scripts for API keys, nodes, and authentication
- Add Docker setup with docker-compose
- Include backup and restore functionality
- Add example scripts for creating API keys and pre-auth keys

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

headscale_backup_and_restore.sh

@@ -0,0 +1,59 @@
+#!/bin/bash
+
+set -e  # Stop script if any command fails
+
+# Parameters
+BACKUP_SERVER="192.168.42.126"
+BACKUP_SERVER_USER="root"
+REMOTE_TMP_DIR="/tmp"
+REMOTE_TARGET_DIR="/opt/headscale"
+
+cd /opt/headscale
+
+NOW=$(date +"%Y%m%d_%H%M%S")
+TARFILE="headscale_backup_$NOW.tar.gz"
+
+echo "1. Stop Headscale Docker service..."
+docker compose down
+
+echo "2. Create tar.gz backup..."
+tar czvf "/tmp/$TARFILE" .
+
+echo "3. Calculate local checksum (db.sqlite)..."
+LOCAL_SUM=$(md5sum /opt/headscale/data/db.sqlite | awk '{print $1}')
+
+echo "4. Start Headscale Docker service again..."
+docker compose up -d
+
+echo "5. Copy backup to backup server..."
+scp "/tmp/$TARFILE" "$BACKUP_SERVER_USER@$BACKUP_SERVER:$REMOTE_TMP_DIR/"
+rm -f "/tmp/$TARFILE"
+
+echo "6. Restore backup and verify checksum on backup server..."
+ssh "$BACKUP_SERVER_USER@$BACKUP_SERVER" "bash -s" <<EOF
+set -e
+START_TIME=\$(date '+%Y%m%d_%H%M%S')
+LOGFILE="$REMOTE_TARGET_DIR/backup_restore_check_\$START_TIME.txt"
+rm -rf $REMOTE_TARGET_DIR
+mkdir -p $REMOTE_TARGET_DIR
+cd $REMOTE_TARGET_DIR
+tar xzvf $REMOTE_TMP_DIR/$TARFILE
+rm -f $REMOTE_TMP_DIR/$TARFILE
+REMOTE_SUM=\$(md5sum $REMOTE_TARGET_DIR/data/db.sqlite | awk '{print \$1}')
+COMPARE_RESULT="NOT MATCH"
+if [ "$LOCAL_SUM" = "\$REMOTE_SUM" ]; then
+    COMPARE_RESULT="MATCH"
+fi
+{
+    echo "=== BACKUP & RESTORE CHECK ==="
+    echo "Time: \$START_TIME"
+    echo "Local db.sqlite md5sum: $LOCAL_SUM"
+    echo "Remote db.sqlite md5sum: \$REMOTE_SUM"
+    echo "Compare result: \$COMPARE_RESULT"
+    echo "Status: Finished restore and checksum"
+    echo "=============================="
+} > "\$LOGFILE"
+EOF
+
+echo "=== DONE ==="
+