feat(casting): add Dokploy stack support

[abhinavmathur-atlan]

Features

• Add Dokploy as an installation platform with the stack flavor.
• Generate a Docker Swarm compose.yaml, component configuration files, schemas, catalog entries, and Dokploy documentation.
• Configure HTTPS routing with a required SIGNOZ_DOMAIN and Traefik labels.

Fixes

• Base Dokploy output on the native Docker Swarm casting instead of Coolify-specific Compose extensions.
• Keep databases on a private overlay network and attach only the SigNoz UI to dokploy-network.
• Avoid host-published ports and make foundryctl cast a documented no-op for Dokploy.

Refactors

• Reuse the existing Swarm forge and configuration-material pipeline for Dokploy stacks.

Tests

• Add Dokploy forge and Cast no-op regression tests.
• Run go test ./... and make docs.
• Run the complete local CLI flow: foundryctl forge, byte-for-byte artifact comparison, docker stack config with a synthetic domain, and foundryctl cast.

Fixes #84

[Nageshbansal]

Hey @abhinavmathur-atlan
It seems GitHub has updated its policy, which is causing issues with the CI. We'll look into what has changed.