Update rego-tunnel to use local rego-vpn image

- Add AnyConnect 4.8 installer to build folder
- Update docker-compose to use rego-vpn:latest local image

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/rego-tunnel/docker-compose.yml

@@ -1,7 +1,7 @@
 services:
   rego-tunnel:
     container_name: rego-tunnel
-    image: rego-windows:latest
+    image: rego-vpn:latest
     restart: unless-stopped
     devices:
       - /dev/kvm