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.json

@@ -3,7 +3,7 @@
   "services": [
     {
       "name": "rego-tunnel",
-      "image": "dockurr/windows:latest",
+      "image": "rego-vpn:latest",
       "environment": {
         "RAM_SIZE": "${WINDOWS_RAM_GB}G",
         "CPU_CORE": "${WINDOWS_CPU_CORES}",