Fix the type error of temperature initialization in Llm class

[lhydave]

Describe the changes you have made:

Change the temperature initialization of Llm class in interpreter/core/llm/llm.py.

Before:

self.temperature = 0

After:

self.temperature = 0.0

This change makes sure that the type of self.temperature is always float rather than int, which is more reliable and friendly for type checking.

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

None.

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