feat(account): add managed credits and cloud gateway

Introduce optional Apple account-backed credits with scoped gateway access while preserving local and BYOK paths. Refresh assistant behavior, tests, privacy disclosures, docs, and the website for the 2.0 experience.

CHANGELOG.md

@@ -8,6 +8,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
+- **Managed-cloud consent**: the first switch to OSG credits now explains which audio, text, context, and account data leaves the device and requires explicit agreement before enabling the service. / **托管云确认**：首次切换到 OSG 积分时会说明哪些音频、文字、上下文与账号数据会离开设备，并在用户明确同意后才启用服务。
+
+### Changed
+- **Focused skill icons**: remove math, indices, arrows, shapes, commerce, keyboard, media, text-formatting, automotive, device, and variable-rendering categories from the custom-skill symbol picker. / **精简技能图标**：从自定义技能图标选择器中移除数学、索引、箭头、形状、商业、键盘、媒体、文本格式、汽车、设备与可变渲染分类。
+
+### Fixed
+- **Cross-process settings safety**: App Group updates now write only changed fields so a stale main-app or keyboard-extension snapshot cannot overwrite newer unrelated settings. / **跨进程设置安全**：App Group 更新现在只写入发生变化的字段，避免主 App 或键盘扩展的旧快照覆盖其他较新的设置。
+- **Account-data freshness**: Settings and Account now share one background-refreshed snapshot, preserve cached content on failure, retry transient read errors, and isolate optional referral outages from core account and credit updates. / **账号数据新鲜度**：设置页与账号页现在共用同一份后台刷新快照，刷新失败时保留缓存内容，对瞬时读取错误自动重试，并避免可选邀请接口故障影响账号与积分更新。
+- **Managed AI task routing**: credit-backed requests now preserve dictation, translation, editing, question, clipboard, custom-skill, and agent intent so the gateway can disable costly reasoning for low-latency transforms. / **托管 AI 任务路由**：积分请求现在会保留听写、翻译、编辑、问答、剪贴板、自定义技能与 Agent 意图，让网关可为低延迟转换任务关闭高成本思考。
+
+## [2.0.0] - 2026-08-19
+
+### Added
+- **Optional OSG account**: add Sign in with Apple, managed credits, App Store credit packs, referrals, profile controls, and in-app account deletion while keeping local dictation and user-owned provider keys independent. / **可选 OSG 账号**：新增 Apple 登录、托管积分、App Store 积分包、邀请、资料管理与 App 内账号注销，同时保持本地听写和用户自备 API Key 独立可用。
 - **Safe AI insertion**: AI answers insert automatically only while the original input field and cursor context still match; otherwise the keyboard retains the answer for explicit insertion or discard. / **安全 AI 上屏**：仅当原输入框和光标上下文仍一致时自动插入 AI 回答；上下文变化时保留回答，由用户明确插入或丢弃。
 
 ### Changed
@@ -19,6 +33,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Removed
 - **Cursor drag pads**: remove blank-area cursor sliding and its Settings toggle; legacy synced values remain decode-compatible. / **光标拖动区**：移除空白区域滑动光标及其设置开关；旧版同步值仍保持解码兼容。
 
+### Fixed
+- **Account confirmation anchors**: sign-out and account-deletion confirmations now open from their selected action rows instead of the profile summary card. / **账号确认弹窗锚点**：退出登录与注销账号确认弹窗现在从对应操作行弹出，不再错误指向资料卡。
+
 ## [1.8.0] - 2026-08-14
 
 > **Release highlights**: See the concise [1.8.0 release notes](docs/RELEASE_NOTES_1.8.0.md) for the key changes since 1.6.6. / **版本亮点**：请参阅精简的 [1.8.0 更新说明](docs/RELEASE_NOTES_1.8.0.md)，了解自 1.6.6 以来的关键变化。