Add Platformatic World to worlds-manifest.json

[marcopiraccini]

Summary

• Add @platformatic/world as a community world backed by a centralized workflow service (@platformatic/workflow) with PostgreSQL
• Introduce a generic docker service type in the CI so worlds can declare arbitrary Docker containers in their manifest services array
• Services are started with --network host and health-checked from the runner

How it works

Platformatic World is a thin HTTP client that talks to an external workflow service. The CI needs two containers:

1. postgres — database for the workflow service
2. platformatic-workflow — the workflow service (platformatic/workflow:latest from Docker Hub)

Both run with --network host so they share localhost with the test runner. The matrix script sets service-type: "docker" for any world whose services aren't the built-in mongodb/redis, and passes the full services JSON to the reusable workflow.

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