Fix issues arising from extension programming guide

[gandie]

Hopefully just minor stuff, like port mapping. Goal is to adjust this closely to the guide, reference extension should "just work"

[changeset-bot]

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Latest commit: 0dab141

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[freisenhauer]

if you change these ports, you also have to change ports in the .env.example (and if executed locally before, also in .env), to ensure, the drizzle scripts continue to work. They could be executed manually through package scripts.