Move session_id to request/response body field

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
2665	1615	61%	50%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
src/pai_rag/app/api/models.py	100%	🟢
src/pai_rag/core/rag_application.py	96%	🟢
TOTAL	98%	🟢

updated for commit: 779734d by action🐍