🛡️ Sentinel: [HIGH] Fix request size limit bypass via chunked transfer encoding

[EffortlessSteven]

🚨 Severity: HIGH
💡 Vulnerability: HTTP chunked transfer encoding bypasses the standard content-length limit checks since the exact size is not predetermined.
🎯 Impact: Without global body limit support on chunked payloads, it can lead to resource exhaustion (Request Smuggling/DoS). The API requires predetermined length for accurate prompt size validation.
🔧 Fix: Added a check in request_sanitization_middleware to reject requests containing transfer-encoding: chunked with a 411 Length Required status code.
✅ Verification: Verified compilation and existing test suites pass.

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PR created automatically by Jules for task 7561371268415162953 started by @EffortlessSteven

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