[Bug][Antigravity] OAuth 授权缺少 aicode 权限导致语音转录失败 / Voice transcription fails due to missing aicode OAuth scope (#2361)

问题描述 / Problem Description

在 Cockpit Tools 中通过 OAuth 登录 Antigravity 账号后，正常的文本对话与代码补全功能均可正常使用，但 Antigravity 2.0+ 内置的**实时语音转录（麦克风输入 / Ctrl+Shift+M）**会在开启约 1 秒后立即中断，无法录入语音。

When authenticating Google Antigravity accounts through Cockpit Tools, standard text prompts and code assistance work as expected, but the built-in Live Voice Transcription (streamAudioTranscription via the microphone button or Ctrl+Shift+M) fails immediately within ~1 second.

错误日志 / Error Logs

检查 Antigravity 运行时控制台（Electron Console）可以看到底层 gRPC 报错：

[AudioStreaming] Stream error: ConnectError: [internal] internal: failed to receive setup response from backend: rpc error: code = PermissionDenied desc = Request had insufficient authentication scopes.
[AudioStreaming] Failed to start: ConnectError: [internal] internal: failed to receive setup response from backend: rpc error: code = PermissionDenied desc = Request had insufficient authentication scopes.

根本原因 / Root Cause

在 src-tauri/src/modules/oauth.rs 和 crates/cockpit-core/src/modules/oauth.rs 中，get_auth_url 生成的 OAuth scopes 列表中缺少了 Antigravity 2.0+ 实时音频流所需的 Google Cloud Code AI 权限： https://www.googleapis.com/auth/aicode

导致获取到的 access_token 和 refresh_token 在调用 Google 语音转录后端时被权限拦截拒绝。

In src-tauri/src/modules/oauth.rs and crates/cockpit-core/src/modules/oauth.rs, the OAuth scopes list in get_auth_url lacks the Google Cloud Code AI scope required for bidirectional audio streaming: https://www.googleapis.com/auth/aicode.

解决方案 / Solution & PR

已经为此提交了 Pull Request，代码修改非常精简（仅在两个模块的 scopes 列表中追加 "https://www.googleapis.com/auth/aicode"）：

PR 已就绪: #2361

麻烦维护者抽空 review 并合并，非常感谢！ Please review and merge #2361. Thank you!