Consolidate model_name and model_path into single model_path parameter

[Copilot]

The fcidump and openfermion models used separate model_name and model_path parameters, constructing file paths as model_path/model_name. This consolidates them into a single model_path parameter containing the complete file path.

Changes

ModelConfig

• Replaced model_name and model_path with single required model_path: pathlib.Path | str parameter
• Removed QMP_MODEL_PATH environment variable fallback logic
• __post_init__ now only converts string to pathlib.Path

Model class

• default_group_name() extracts name from path by stripping file extensions inline using removesuffix()
• __init__() uses the full path directly without extracting or displaying model names
• Simplified logging to not include model names
• YAML lookup in fcidump.py extracts filename inline for key lookup

Migration

# Before
ModelConfig(model_name="h2o", model_path="models/")
# → models/h2o.FCIDUMP.gz

# After  
ModelConfig(model_path="models/h2o.FCIDUMP.gz")
# or
ModelConfig(model_path="models/h2o")

Both relative and absolute paths are supported via native pathlib behavior.

Original prompt

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This section details on the original issue you should resolve

<issue_title>更改qmp/models 下 fcidump和openfermion的数据输入格式</issue_title>
<issue_description>目前有model name和model path， 实际上取的是 model_path/model_name 现在用同一个变量 model_path 来表示输入文件的完整地址（可以是相对的，直接用默认行为，不用特殊处理相对地址）</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 更改qmp/models 下 fcidump和openfermion的数据输入格式 #141

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[hzhangxyz]

你已经有全名了，不用提取后再合并得到路径，直接用输入的全名来读取就行了。

一些日志相关的东西之前用了model name， 但是可以直接把这一项目给去掉， 不显示model name了。

[Copilot]

你已经有全名了，不用提取后再合并得到路径，直接用输入的全名来读取就行了。

一些日志相关的东西之前用了model name， 但是可以直接把这一项目给�...

Done. Removed the _extract_model_name_from_path helper function and all model_name variables. Logging now only shows the file path without extracting or displaying model names. (5bb239e)