Final security vulnerability fixes

Updated to latest secure versions:
- FastAPI: 0.116.1 → 0.117.1
- uvicorn: 0.35.0 → 0.37.0
- requests: 2.32.3 → 2.32.5
- psycopg2-binary: 2.9.9 → 2.9.10
- PyYAML: 6.0.1 → 6.0.2

✅ Trivy security scan shows no vulnerabilities
✅ All 78 tests passing
✅ Requirements.txt updated to match installed versions

Resolves GitHub security vulnerabilities.

Author: vinod0m

requirements.txt

@@ -2,7 +2,7 @@ langchain==0.3.27
 langchain-google-genai==2.1.9
 langchain-community==0.3.27
 langchain-ollama==0.3.6
-fastapi==0.116.1
-uvicorn==0.35.0
-psycopg2-binary==2.9.9
-PyYAML==6.0.1
+fastapi==0.117.1
+uvicorn==0.37.0
+psycopg2-binary==2.9.10
+PyYAML==6.0.2