fix(networking): handle malformed headers from llama-swap (#1646)

[mohamedjihedriahi]

Describe the changes you have made:

This PR fixes an httpx.RemoteProtocolError that occurs when connecting to local servers (like llama-swap) that send malformed HTTP headers (specifically multiple Transfer-Encoding headers).

Specific changes:

• Upgraded litellm dependency to handle looser HTTP parsing.
• Added a specific exception handler for httpx.RemoteProtocolError.
• Refactored the code to handle optional server dependencies gracefully.

Reference any relevant issues (e.g. "Fixes #000"):

Fixes #1646

Pre-Submission Checklist (optional but appreciated):

• I have included relevant documentation updates (stored in /docs)
• I have read docs/CONTRIBUTING.md
• I have read docs/ROADMAP.md

OS Tests (optional but appreciated):

• Tested on Windows
• Tested on MacOS
• Tested on Linux