fix: align model capabilities schema with OpenCode v2 root properties…

[ganimalqudhaifi]

Based on the dev branch, added root properties (reasoning, attachment, tool_call, modalities) for OpenCode v2 compatibility.

Summary by CodeRabbit

• Bug Fixes
  • Improved compatibility with OpenCode v2 model caching.
  • Preserved model-specific settings, including reasoning, attachments, tool calls, temperature, modalities, and input/output capabilities.
  • Prevented model configuration changes from unintentionally affecting shared defaults.

[ganimalqudhaifi]

you can check this different with 'opencode models google-agy --verbose'

[ganimalqudhaifi]

I've pushed a fix to this branch. The actual root cause wasn't the spread order in getModelsList, but rather the config hook forcefully assigning JSON.parse(JSON.stringify(STATIC_MODELS)) to config.provider[AGY_PROVIDER_ID].models. This wiped out all custom capabilities specified in the user's opencode.json before getModelsList was even executed. I've updated the config hook to invoke getModelsList() directly so it deep-merges properly.