feat(vpn): add tag-aware WireGuard AllowedIPs for VPN-gated routes

test_watch/devserver.ts

@@ -1,6 +1,8 @@
 import { DcRouter } from '../ts/index.js';
 
 const devRouter = new DcRouter({
+  // Server public IP (used for VPN AllowedIPs)
+  publicIp: '203.0.113.1',
   // SmartProxy routes for development/demo
   smartProxyConfig: {
     routes: [
@@ -23,7 +25,19 @@ const devRouter = new DcRouter({
           tls: { mode: 'passthrough' },
         },
       },
-    ],
+      {
+        name: 'vpn-internal-app',
+        match: { ports: [18080], domains: ['internal.example.com'] },
+        action: { type: 'forward', targets: [{ host: 'localhost', port: 5000 }] },
+        vpn: { required: true },
+      },
+      {
+        name: 'vpn-eng-dashboard',
+        match: { ports: [18080], domains: ['eng.example.com'] },
+        action: { type: 'forward', targets: [{ host: 'localhost', port: 5001 }] },
+        vpn: { required: true, allowedServerDefinedClientTags: ['engineering'] },
+      },
+    ] as any[],
   },
   // VPN with pre-defined clients
   vpnConfig: {