feat: add OpenAI and Qwen OAuth auth support to Zed ACP integration (#678)

- Add USE_OPENAI and QWEN_OAUTH authentication methods to GeminiAgent's authMethods array
- Enables Zed editor integration to support all available authentication options
- Add test case for QWEN_OAUTH authentication configuration
- Maintains backward compatibility with existing Google authentication methods

This allows Zed users to authenticate using:
- OpenAI API key (requires OPENAI_API_KEY environment variable)
- Qwen OAuth (2000 daily requests with OAuth2 flow)
- Existing Google authentication methods (unchanged)

packages/cli/src/zed-integration/zedIntegration.ts

@@ -97,6 +97,18 @@ class GeminiAgent {
         name: 'Vertex AI',
         description: null,
       },
+      {
+        id: AuthType.USE_OPENAI,
+        name: 'Use OpenAI API key',
+        description:
+          'Requires setting the `OPENAI_API_KEY` environment variable',
+      },
+      {
+        id: AuthType.QWEN_OAUTH,
+        name: 'Qwen OAuth',
+        description:
+          'OAuth authentication for Qwen models with 2000 daily requests',
+      },
     ];
 
     return {