Add node deletion functionality to FARMQ Admin

- Add DELETE API endpoint for node deletion via Headscale CLI
- Add delete buttons to both table and card views in machine list
- Implement confirmation dialog with clear warning message
- Add proper error handling and user feedback with toast messages
- Auto-refresh page after successful deletion
- Match Headplane functionality for complete node management

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

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

farmq-admin/app.py

@@ -15,6 +15,7 @@ from utils.database_new import (
     get_machine_detail, get_pharmacy_detail, get_active_alerts,
     sync_machines_from_headscale, sync_users_from_headscale
 )
+import subprocess
 from utils.proxmox_client import ProxmoxClient
 
 def create_app(config_name=None):
@@ -400,6 +401,42 @@ def create_app(config_name=None):
             print(f"❌ VM 정지 오류: {e}")
             return jsonify({'error': str(e)}), 500
     
+    # 노드 삭제 API
+    @app.route('/api/nodes/<int:node_id>/delete', methods=['DELETE'])
+    def api_delete_node(node_id):
+        """노드 삭제 API"""
+        try:
+            # Headscale CLI를 통해 노드 삭제
+            result = subprocess.run(
+                ['docker', 'exec', 'headscale', 'headscale', 'nodes', 'delete', '-i', str(node_id), '--force'],
+                capture_output=True,
+                text=True,
+                check=True
+            )
+            
+            # 삭제 성공
+            return jsonify({
+                'success': True, 
+                'message': f'노드 {node_id}가 성공적으로 삭제되었습니다.',
+                'output': result.stdout
+            })
+            
+        except subprocess.CalledProcessError as e:
+            # Headscale CLI 오류
+            error_msg = e.stderr if e.stderr else e.stdout
+            return jsonify({
+                'success': False,
+                'error': f'노드 삭제 실패: {error_msg}'
+            }), 400
+            
+        except Exception as e:
+            # 기타 오류
+            print(f"❌ 노드 삭제 오류: {e}")
+            return jsonify({
+                'success': False,
+                'error': f'서버 오류: {str(e)}'
+            }), 500
+    
     # 에러 핸들러
     @app.errorhandler(404)
     def not_found_error(error):