🔧 Fix Headplane UI configuration and enable external access

- Update docker-compose.yml: simplify environment variables
- Fix headplane-config/config.yaml with proper configuration:
  * Add required server section with correct cookie_secret (32 chars)
  * Configure headscale connection with API key
  * Enable external access via 192.168.0.151:3000/admin/
- Resolve configuration validation errors
- Headplane UI now fully accessible and functional

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docker-compose.yml

@@ -30,15 +30,8 @@ services:
     restart: unless-stopped
     environment:
       - TZ=Asia/Seoul
-      - HOST=0.0.0.0
-      - PORT=3000
       - HEADSCALE_URL=http://headscale:8080
-      - ROOT_API_KEY=${HEADSCALE_API_KEY}
-      - HEADSCALE_INTEGRATION=docker
-      - HEADSCALE_CONTAINER=headscale
-      - COOKIE_SECRET=headscale-ui-secret-key-change-me
-      - COOKIE_SECURE=false
-      - DISABLE_API_KEY_LOGIN=false
+      - HEADSCALE_API_KEY=${HEADSCALE_API_KEY}
     volumes:
       - ./headplane-config:/etc/headplane
     ports:

headplane-config/config.yaml

@@ -1,2 +1,15 @@
-# Minimal config file for Headplane
-# Environment variables will override these settings
+headscale:
+  url: http://headscale:8080
+  api_key: 8qRr1IB.tV95CmA0fLaCiGGIgBfeoN9daHceFkzI
+  config_strict: false
+
+server:
+  host: 0.0.0.0
+  port: 3000
+  cookie_secret: headscale-ui-secret-32-chars-key
+  cookie_secure: false
+
+settings:
+  title: "Headscale 관리 패널"
+  favicon_url: ""
+  custom_css: ""