fix(cliproxy): migrate deprecated gemini-claude-* model names to upstream claude-* names (#515)

* fix(cliproxy): migrate deprecated gemini-claude-* model names to upstream claude-* names

CLIProxyAPI registry no longer recognizes the gemini-claude-* prefix convention.
Model names in catalog, base config, and user settings are migrated to upstream
claude-* names. Auto-migration in env-builder rewrites existing user settings on
load and persists the change.

Closes #513

* fix: address code review feedback — sync UI layer and add migration tests

- Sync UI isNativeGeminiModel() with backend (remove gemini-claude- exclusion)
- Update UI model catalog agy entries from gemini-claude-* to claude-*
- Update CI/CD workflow and code-reviewer default model names
- Add unit tests for migrateDeprecatedModelNames() logic

scripts/code-reviewer.ts

@@ -26,7 +26,7 @@ interface PRContext {
 // Config
 const MAX_DIFF_LINES = 10000;
 const CLIPROXY_URL = process.env.CLIPROXY_URL || 'http://localhost:8317';
-const MODEL = process.env.REVIEW_MODEL || 'gemini-claude-opus-4-6-thinking';
+const MODEL = process.env.REVIEW_MODEL || 'claude-opus-4-6-thinking';
 
 // System prompt for code review - new style
 const CODE_REVIEWER_SYSTEM_PROMPT = `You are the CCS AGY Code Reviewer, an expert AI assistant reviewing pull requests for the CCS CLI project.