Fixes #1973 [GenAI orchestrator] Container gen-ai-orchestrator-server Crash at startup with error No module named 'langfuse.callback'

* Initial plan

* Fix langfuse import paths for version 3.3.0+

Co-authored-by: vsct-jburet <12413454+vsct-jburet@users.noreply.github.com>

* fix dependency

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: vsct-jburet <12413454+vsct-jburet@users.noreply.github.com>
Co-authored-by: Julien Buret <jburet@voyages-sncf.com>

Author: Copilot

.pre-commit-config.yaml

@@ -45,5 +45,5 @@ repos:
       - id: pip-audit
         additional_dependencies:
           - "pip>=25.3"
-          - "filelock>=3.20.1"
+          - "filelock>=3.20.3"
           - "urllib3>=2.6.3"

gen-ai/orchestrator-server/src/main/python/server/src/gen_ai_orchestrator/services/langchain/factories/callback_handlers/callback_handlers_factory.py

@@ -18,7 +18,7 @@
 from abc import ABC, abstractmethod
 from typing import Any
 
-from langfuse.callback.langchain import LangchainCallbackHandler
+from langfuse.langchain.CallbackHandler import LangchainCallbackHandler
 from pydantic import BaseModel
 
 from gen_ai_orchestrator.models.observability.observability_setting import (

gen-ai/orchestrator-server/src/main/python/server/src/gen_ai_orchestrator/services/langchain/factories/callback_handlers/langfuse_callback_handler_factory.py

@@ -24,7 +24,7 @@
 from httpx_auth_awssigv4 import SigV4Auth
 from langfuse import Langfuse
 from langfuse.api.core import ApiError
-from langfuse.callback import CallbackHandler as LangfuseCallbackHandler
+from langfuse.langchain import CallbackHandler as LangfuseCallbackHandler
 
 from gen_ai_orchestrator.configurations.environment.settings import (
     application_settings,

gen-ai/orchestrator-server/src/main/python/server/src/gen_ai_orchestrator/services/langchain/factories/langchain_factory.py

@@ -26,7 +26,7 @@
 from typing import Any, Optional
 
 from langchain_core.embeddings import Embeddings
-from langfuse.callback import CallbackHandler as LangfuseCallbackHandler
+from langfuse.langchain import CallbackHandler as LangfuseCallbackHandler
 
 from gen_ai_orchestrator.configurations.environment.settings import (
     application_settings,

gen-ai/orchestrator-server/src/main/python/server/src/gen_ai_orchestrator/services/langchain/rag_chain.py

@@ -41,7 +41,7 @@
     RunnableSerializable,
 )
 from langchain_core.vectorstores import VectorStoreRetriever
-from langfuse.callback import CallbackHandler as LangfuseCallbackHandler
+from langfuse.langchain import CallbackHandler as LangfuseCallbackHandler
 from typing_extensions import Any
 
 from gen_ai_orchestrator.errors.exceptions.exceptions import (

gen-ai/orchestrator-server/src/main/python/server/src/gen_ai_orchestrator/services/observability/observabilty_service.py

@@ -17,7 +17,7 @@
 import logging
 from typing import Optional
 
-from langfuse.callback import CallbackHandler as LangfuseCallbackHandler
+from langfuse.langchain import CallbackHandler as LangfuseCallbackHandler
 
 from gen_ai_orchestrator.models.observability.observability_type import (
     ObservabilitySetting,