🛡️ Sentinel: [HIGH] Fix Unbounded Payload DoS & Request Smuggling

[EffortlessSteven]

🚨 Severity: HIGH
💡 Vulnerability: The request sanitization middleware was vulnerable to unbounded payload DoS and HTTP Request Smuggling due to incorrect handling of transfer-encoding: chunked.
🎯 Impact: Attackers could cause a Denial of Service (DoS) by exhausting server memory or exploit request smuggling.
🔧 Fix: Explicitly rejected requests with transfer-encoding: chunked returning 411 Length Required to ensure all requests have a known, verifiable Content-Length.
✅ Verification: Verified code compilation and existing tests passed.

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PR created automatically by Jules for task 11328474773150694273 started by @EffortlessSteven

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