test: add backend pytest checks and e2e smoke flow

[kowshii27-rbg]

Add starter backend model/API pytest coverage and a frontend Playwright smoke spec for key user flows. Also document the local Docker Postgres pytest setup and use dedicated test settings so contributors can run tests reliably.

Thank you.....

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Thank you for the pull request! ❤️

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Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• Tests for changes have been written and the TypeScript, pytest and formatting workflows within the PR checks do not indicate new errors in the files changed

• The Playwright end to end and Zap penetration tests have been ran and are passing (if necessary)

• The changelog has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[github-actions]

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