feat: add Chisel app template and SVG icon for service availability

[P4PER]

Summary

• Add Chisel Tunnel as a new app template, enabling users to securely access project services (MongoDB, Redis, Postgres, etc.) from their local machine via TCP-over-WebSocket tunneling
• Chisel runs as a regular app within a project and is routed through Traefik via a domain — no additional ports need to be opened on the server
• Authentication is handled via --auth flag with auto-generated credentials (username/password visible in Environment tab)

How it works

1. Deploy the Chisel Tunnel template in a project alongside other services
2. Assign a domain (e.g. tunnel.example.com) pointing to port 8080
3. Connect locally:

   chisel client --auth chisel:<password> https://tunnel.example.com \
     27017:svc-app-<mongo-id>:27017 \
     6379:svc-app-<redis-id>:6379

4. Access services on localhost as if running locally

Test plan

• Deploy Chisel Tunnel template in a project
• Verify container starts with correct --auth args
• Assign a domain and verify Traefik routes WebSocket traffic
• Connect with chisel client and verify TCP tunneling to other project services

[vercel]

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[biersoeckli]

@P4PER

Thanks for contributing!

I added a small fix in app.service.ts wich prevented the template from being created.