refactor: rephrasing chain and chat graph #247

Job	Run time
Detect Changes	6s
sanitize-branch-name	2s
Build and Test Services (document-extractor)	2m 10s
Build and Test Libraries (extractor-api-lib)	43s
Build and Test Services (mcp-server)	1m 1s
Build and Test Libraries (rag-core-api)	45s
Build and Test Services (rag-backend)	1m 17s
Build and Test Services (admin-backend)	1m 9s
Build and Test Libraries (rag-core-lib)	50s
Build and Test Libraries (admin-api-lib)	49s
Validate Infrastructure	0s
Build and Test Frontend	0s
CI Summary	3s
	8m 55s

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