Caddy web server support

[masonjames]

Hey everyone!

I've open PR adding Caddy as an alternative web server provider for Dokploy: #4534

Current implementation includes:

• Caddy provider setup/generation/reload support alongside Traefik
• Provider-aware domain handling, including adding/removing domains on existing services and domains created with new services
• Traefik -> Caddy migration tooling with dry-run/review output and rollback support
• LetsEncrypt via Caddy, plus custom SSL certificate handling
• Cloudflare/proxy-aware trusted proxy settings
• Dokploy UI for selecting the active provider, running/reviewing Caddy migration, configuring trusted proxies, and viewing generated Caddy files/logs

I'm using this on my live Dokploy environment, but it would be very helpful to get more feedback before this is considered ready to merge.

If anyone is able to test the PR, the most useful areas to validate are:

• Creating a new app/service with a domain
• Adding/removing domains on an existing app/service
• Custom certificate behavior
• Cloudflare proxied domains and trusted proxy settings
• Migration from an existing Traefik setup to Caddy
• Any UI issues around Web Server settings or generated Caddy config files

Please share your Dokploy setup, what you tested, and any failures or confusing behavior you hit. Logs, generated caddy.json snippets, and exact reproduction steps would be especially useful.