🛡️ Sentinel: [MEDIUM] Fix Input Leakage in Configuration Error Messages

[davidruzicka]

Modifies env-config-parser.ts to stop interpolating the raw environment variable value (entry) when rejecting an invalid category. Modifies header-config-parser.ts to stop echoing the raw header entry (part) when it exceeds the maximum length limit. Both changes use a generic error message, mitigating potential information leakage and injection vulnerabilities where sensitive user inputs or configuration values might otherwise be exposed in server error logs or client responses.

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PR created automatically by Jules for task 18378798515867092083 started by @davidruzicka

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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