fix(typo3): allow static route source and content properties

[Solaris-star]

Summary

• declare source and content in the static route object's parent properties so draft-07 additionalProperties recognizes them
• keep the conditional requirements for uri and staticText routes
• cover both route types in the TYPO3 positive test fixture

Fixes #6020

Testing

• node ./cli.js check --schema-name=typo3.json
• node ./cli.js check
• node ./cli.js coverage
• npm run typecheck
• npm run eslint
• npx prettier --config .prettierrc.cjs --ignore-path .gitignore --check src/schemas/json/typo3.json src/test/typo3/typo3.yml

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @madskristensen and @hyperupcall - if they write a comment saying "LGTM" then it will be merged.

[hyperupcall]

Thanks