YeonGyu-Kim 898d3e6175 fix(cli): migrate Gemini models to explicit antigravity- prefix for quota routing
All Gemini model references now use the `antigravity-` prefix to ensure explicit
routing to Antigravity quota pools instead of relying on legacy `-preview` suffix
disambiguation. This approach prevents potential breakage if Google removes the
`-preview` suffix in future versions.

Updates include:
- config-manager: Updated Gemini model assignments with antigravity- prefix
- config-manager.test.ts: Updated test assertions to match new naming convention
- install.ts: Updated config summary display to show antigravity-prefixed model name

Migration follows opencode-antigravity-auth plugin v1.2.7+ guidance for explicit
quota routing configuration.

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
2026-01-05 23:36:10 +09:00
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