Change extra_volumes to Optional in get_model_env

[connor-tan]

Description

utils/env.py:963 在 QTDockerEnv.prepare() 里执行 next(iter(self.conf.extra_volumes.keys()))，但 self.conf.extra_volumes 是空字典，抛出 StopIteration。

原因是这里把默认值覆盖掉了：

components/coder/model_coder/conf.py:27 get_model_env() 的参数 extra_volumes 默认是 {}，然后无条件执行 env.conf.extra_volumes = extra_volumes.copy()，这会把 utils/env.py 里 QlibDockerConf 的默认 extra_volumes 覆盖成空。

Motivation and Context

How Has This Been Tested?

• If you are adding a new feature, test on your own test scripts.

Screenshots of Test Results (if appropriate):

1. Your own tests:

Types of changes

• Fix bugs
• Add new feature
• Update documentation

---

📚 Documentation preview 📚: https://RDAgent--1321.org.readthedocs.build/en/1321/

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[SunsetWolf]

Hi, @connor-tan , Thanks for the PR. I have a few questions and suggestions:

• What is the motivation for upgrading scipy from 1.11.4 to 1.12.0? Is this change required for the proposed functionality?

• The .env file is intended to be user-specific. It generally should not be committed—could you explain why it was included?

• Please update the PR title so that it conforms to the lint-title rules and passes CI.

• The change to get_model_env is incorrect. When extra_volumes is provided, it currently overwrites the existing configuration. It should follow an extend pattern instead so default volumes are preserved.

Please take a look and update accordingly. Thanks!