Add server links management and timeout guard for VM/container discovery

app/app.py

@@ -42,6 +42,7 @@ class Server(db.Model):
     last_collected = db.Column(db.DateTime, nullable=True)
     details = db.Column(db.JSON, nullable=True)
     notes = db.Column(db.Text, default='')
+    links = db.Column(db.JSON, default=list)  # [{"label": "...", "url": "..."}]
     parent_hostname = db.Column(db.String(255), default='')
     __table_args__ = (db.UniqueConstraint('username', 'hostname', name='uq_user_host'),)
 
@@ -319,6 +320,11 @@ def index():
     return render_template('index.html', groups=groups, children_map=children_map, build_date=BUILD_DATE)
 
 
+@app.route('/api/version')
+def api_version():
+    return jsonify({'build_date': BUILD_DATE})
+
+
 @app.route('/api/servers')
 def api_servers():
     servers = Server.query.all()
@@ -334,6 +340,7 @@ def api_servers():
             'is_online': s.is_online,
             'last_collected': s.last_collected.isoformat() if s.last_collected else None,
             'notes': s.notes,
+            'links': s.links or [],
             'parent_hostname': s.parent_hostname,
             'details': s.details,
         })
@@ -497,6 +504,16 @@ def api_update_notes(server_id):
     return jsonify({'ok': True})
 
 
+@app.route('/api/servers/<int:server_id>/links', methods=['PUT'])
+def api_update_links(server_id):
+    from flask import request
+    server = Server.query.get_or_404(server_id)
+    data = request.get_json()
+    server.links = data.get('links', [])
+    db.session.commit()
+    return jsonify({'ok': True})
+
+
 def _ip_sort_key(ip_str):
     if not ip_str:
         return [999, 999, 999, 999]
@@ -646,6 +663,7 @@ def migrate_db():
         'url': "ALTER TABLE servers ADD COLUMN url VARCHAR(1024) DEFAULT ''",
         'notes': "ALTER TABLE servers ADD COLUMN notes TEXT DEFAULT ''",
         'parent_hostname': "ALTER TABLE servers ADD COLUMN parent_hostname VARCHAR(255) DEFAULT ''",
+        'links': "ALTER TABLE servers ADD COLUMN links JSON DEFAULT '[]'",
     }
     for col, sql in migrations.items():
         if col not in existing: