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>

docker-compose.yml

@@ -0,0 +1,22 @@
+services:
+  headscale:
+    image: headscale/headscale:latest
+    container_name: headscale
+    volumes:
+      - ./config:/etc/headscale
+      - ./data:/var/lib/headscale
+    ports:
+      - "8080:8080"
+      - "9090:9090"
+      - "50443:50443"
+    command: serve
+    labels:
+      - "com.centurylinklabs.watchtower.enable=true"
+    restart: unless-stopped
+    networks:
+      - shared-net
+
+networks:
+  shared-net:
+    external: true
+