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## Summary This PR passes `session_id` into Langfuse trace observations so multi-turn chat messages can be grouped under the same session in Langfuse. Changes include: - Propagate `session_id` from chat/session APIs into `dialog_service.async_chat`. - Pass `session_id` into Langfuse `start_observation(...)`. - Share Langfuse `trace_context` with chat, embedding, rerank, and TTS model bundles where applicable. - Add unit coverage to verify Langfuse observations receive `session_id`. - Update affected test stubs for the new optional Langfuse context arguments. ## Related Issue Closes: #15636 ## Change Type - [x] Feature - [x] Bug fix - [x] Test - [ ] Refactor - [ ] Documentation - [ ] Breaking change ## Real Behavior Proof Before this change: - Langfuse observations were created without `session_id`. - Multi-turn chat traces could not be grouped by session in Langfuse. After this change: - Chat/session flows pass `session_id` into `async_chat`. - Langfuse observations include `session_id`. - Related model bundles receive shared trace context and session metadata. Validation result: ```bash uv run python -m py_compile \ api/db/services/tenant_llm_service.py \ api/db/services/llm_service.py \ api/db/services/dialog_service.py \ api/db/services/conversation_service.py \ api/apps/restful_apis/chat_api.py \ test/unit_test/api/db/services/test_dialog_service_final_answer.py \ test/unit_test/api/db/services/test_dialog_service_use_sql_source_columns.py ``` Passed. ```bash uv run pytest \ test/unit_test/api/db/services/test_dialog_service_final_answer.py \ test/unit_test/api/db/services/test_dialog_service_use_sql_source_columns.py -q ``` Result: ```text 11 passed in 16.89s ``` ```bash git diff --check ``` Passed. ## Checklist - [x] Analyzed the issue requirement. - [x] Checked existing Langfuse trace integration. - [x] Implemented only the requested session grouping behavior. - [x] Added/updated unit tests. - [x] Ran focused tests successfully. - [x] Ran Python compile validation. - [x] Ran whitespace diff validation.