dsh-model-extended: Configure Thinking Intensity and Input Modality Independently per Model Row

The DSH (DeepSeek Harness) plugin `dsh-model-extended` moves thinking intensity and input modality configuration from the connection level to the model row level, allowing users to configure each model individually. The plugin supports UI checkboxes, explicit declaration of no thinking capability, pre-request validation, and custom provider field mapping. After installation, restart `dsh` and refresh the page for the changes to take effect. The configuration uses YAML; note that YAML 1.2 parsers may handle boolean values (such as `off`) differently.