docs: 补充 CLAUDE.md 遗漏的 gemini provider 类型

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Co-Authored-By: Claude <[email protected]>

CLAUDE.md

@@ -72,6 +72,7 @@ The system supports multiple provider types via `providerType` field:
 - `claude` - Anthropic API (standard)
 - `claude-auth` - Claude relay services (Bearer auth only)
 - `codex` - Codex CLI (Response API)
+- `gemini` - Gemini API
 - `gemini-cli` - Gemini CLI
 - `openai-compatible` - OpenAI Compatible APIs