fix(agents-api): Fix embedding model litellm error (#870)

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> [!IMPORTANT]
> Commented out a line in `aembedding()` in `litellm.py` to prevent
errors with `voyage/voyage-3` model.
> 
>   - **Behavior**:
> - Commented out line in `aembedding()` in `litellm.py` to prevent
errors with `voyage/voyage-3` model.
>     - The line `model = f"openai/{model}"` is temporarily disabled.
>   - **Misc**:
>     - No other changes or fixes are included in this PR.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
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for 3d429be. It will automatically
update as commits are pushed.</sup>

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---------

Co-authored-by: HamadaSalhab <[email protected]>

agents-api/agents_api/clients/litellm.py

@@ -58,8 +58,9 @@ async def aembedding(
     custom_api_key: None | str = None,
     **settings,
 ) -> list[list[float]]:
-    if not custom_api_key:
-        model = f"openai/{model}"  # FIXME: This is for litellm
+    # Temporarily commented out (causes errors when using voyage/voyage-3)
+    # if not custom_api_key:
+    # model = f"openai/{model}"  # FIXME: This is for litellm
 
     if isinstance(inputs, str):
         input = [inputs]