No JSON endpoint for the assistant model catalog

[adrianipopescu]

To enumerate models you have to scrape <option> tags from GET /html/settings/assistant. Works, but brittle — any template change breaks it.

Both ki_* profile slugs and the underlying LLM slugs (claude-4-7-opus, gpt-5-5, gemini-3-pro, etc.) live in that same form, so the data is already there. Just want it shaped:

kagi assistant models --json

Internal impl can keep scraping; just stabilize the output.

[Microck]

Fixed in #113.

kagi assistant models now returns a stable JSON catalog of base-model options parsed from the custom assistant form. The output shape is:

{
  "models": [
    {
      "id": "gpt-5-mini",
      "label": "GPT 5 Mini",
      "selected": true
    }
  ]
}

Verification added:

• parser coverage for base_model radios
• integration coverage for kagi assistant models