gao-gao-zai/dsh-custom-reasoning: Configure the reasoning level for the DSH pi-ai model

`gao-gao-zai/dsh-custom-reasoning` is an MIT-licensed DSH plugin designed to centrally manage custom `pi-ai` model reasoning levels and Provider thinking formats. It introduces a "Reasoning Level" section in the DSH Web Settings page, allowing users to configure reasoning levels ranging from `off` to `max` for each model and select from various thinking formats, including `openai` and `deepseek`. The plugin supports drag-and-drop selection and copy-paste configuration for batch operations, with modifications automatically saved and concurrent conflicts prevented through a Revision mechanism. To install, clone the code repository and execute `dsh plugin --profile web add .`.