feat(antigravity): 对齐 AM 客户端标识，前端 OAuth 增加 TOTP 支持

- User-Agent 改为 Electron 浏览器格式，新增 x-client-name/x-client-version/x-vscode-sessionid/x-goog-api-client header
- 移除 MODEL_ALIAS_MAP 别名映射，改为仅剥离 -online 后缀
- thinking 自动注入关键字新增 gemini-3.1-pro
- 新增定时 Antigravity UA 版本刷新任务（每 6 小时 + 启动时）
- 前端 OAuth 设备授权新增 TOTP 验证码生成（otpauth），Region 改为按钮选择
- SSO OIDC 轮询日志 authorization_pending/slow_down 降级为 debug

frontend/package-lock.json

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@@ -4512,6 +4514,18 @@
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+      "funding": {
+        "url": "https://github.com/hectorm/otpauth?sponsor=1"
+      }
+    },
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@@ -4734,7 +4747,6 @@
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