Fix stream_options UserWarning in LLM client initialization

[beastoin]

Current Behavior

Every time the API container starts, LangChain's ChatOpenAI emits repeated UserWarning logs:

WARNING! stream_options is not default parameter.
    stream_options was transferred to model_kwargs.
    Please confirm that stream_options is what you intended.

This fires for each streaming client initialized in utils/llm/clients.py (7 clients), and repeats on every worker process startup via routers/conversations.py import chain.

Expected Behavior

Clean startup logs with no warnings.

Affected Areas

File	Line	Description
backend/utils/llm/clients.py	19, 26, 34, 42, 52, 62, 72	stream_options={"include_usage": True} passed to ChatOpenAI

Solution

Move stream_options into model_kwargs explicitly to suppress the warning:

# Before
llm_mini_stream = ChatOpenAI(
    model='gpt-4.1-mini',
    streaming=True,
    stream_options={"include_usage": True},
    callbacks=[_usage_callback],
)

# After
llm_mini_stream = ChatOpenAI(
    model='gpt-4.1-mini',
    streaming=True,
    model_kwargs={"stream_options": {"include_usage": True}},
    callbacks=[_usage_callback],
)

Files to Modify

• backend/utils/llm/clients.py

Impact

None — stream_options is already being transferred to model_kwargs internally. This just makes it explicit and silences the warning.

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by AI for @beastoin