Approval flow + JSON validated string feature settings

[kp-cat]

Describe the purpose of your pull request

• JSON validated string feature setting + Change requests support

Related issues (only if applicable)

• https://trello.com/c/s0bcBsnQ/213-mcp

How to test? (only if applicable)

• Check the mcp server with an AI client

Security (only if applicable)

• Updated dependencies to fix vulnerabilities

Requirement checklist (only if applicable)

• I have covered the applied changes with automated tests.
• I have executed the full automated test set against my changes.
• I have validated my changes against all supported platform versions.
• I have read and accepted the contribution agreement.