🛡️ Sentinel: [CRITICAL] Fix Content-Length Limit Bypass

[EffortlessSteven]

🚨 Severity: CRITICAL
💡 Vulnerability: The request validation middleware relied solely on the content-length header to enforce maximum request payload sizes. A malicious client could send requests with Transfer-Encoding: chunked, omitting the content-length header and bypassing the size restrictions.
🎯 Impact: Exposes the server to memory exhaustion and Denial of Service (DoS) attacks.
🔧 Fix: Rejected Transfer-Encoding: chunked outright in the request size validation middleware to enforce strict content-length limits.
✅ Verification: Verified compilation, ran cargo clippy and test suite, and documented the learning in .jules/sentinel.md.

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PR created automatically by Jules for task 2814229269089629804 started by @EffortlessSteven

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