chore: adopt source-available license and strengthen privacy disclosures

Replace MIT with a restrictive source-available license and align README/docs copy. Add cloud polish acknowledgment, privacy manifest updates, voice history disclosure, export compliance metadata, and support links for App Store readiness.

docs/index.html

@@ -719,7 +719,7 @@
 
   <footer class="footer">
     <div class="footer-inner">
-      <span data-i18n="footer.copy">© OSGKeyboard — open source under MIT</span>
+      <span data-i18n="footer.copy">© OSGKeyboard — source available</span>
       <span>
         <a href="https://github.com/hkgood/OSGKeyboard" data-i18n="footer.source">Source code</a>
         ·
@@ -732,7 +732,7 @@
     const copy = {
       en: {
         "nav.github": "GitHub",
-        "hero.eyebrow": "Open source · iOS 26+",
+        "hero.eyebrow": "Source available · iOS 26+",
         "hero.title": "Hold to talk.<br>Polished text in any app.",
         "hero.lead": "A custom keyboard that transcribes your voice on-device and optionally polishes the result with the LLM you configure — WeChat, Notes, Mail, ChatGPT, and everywhere else you type.",
         "hero.cta.primary": "View on GitHub",
@@ -768,13 +768,13 @@
         "privacy.title": "Privacy at a glance",
         "privacy.body": "Audio is processed on your device. We do not log ordinary keystrokes. In cloud polish mode, only transcribed text — never audio — goes to the API provider you configure.",
         "privacy.cta": "Read full policy",
-        "footer.copy": "© OSGKeyboard — open source under MIT",
+        "footer.copy": "© OSGKeyboard — source available",
         "footer.source": "Source code",
         "footer.privacy": "Privacy"
       },
       zh: {
         "nav.github": "GitHub",
-        "hero.eyebrow": "开源 · 需要 iOS 26+",
+        "hero.eyebrow": "源码可见 · 需要 iOS 26+",
         "hero.title": "按住说话，<br>任意 App 里获得润色文字。",
         "hero.lead": "自定义键盘扩展：在设备端转写语音，并可选通过你配置的 LLM 润色结果。适用于微信、备忘录、邮件、ChatGPT 等所有出现键盘的场景。",
         "hero.cta.primary": "GitHub 仓库",
@@ -810,7 +810,7 @@
         "privacy.title": "隐私摘要",
         "privacy.body": "音频在设备端处理。我们不记录普通击键。云端润色模式下，仅转写文字（非音频）会发送到你配置的 API 服务商。",
         "privacy.cta": "查看完整政策",
-        "footer.copy": "© OSGKeyboard · MIT 开源",
+        "footer.copy": "© OSGKeyboard · 源码可见",
         "footer.source": "源代码",
         "footer.privacy": "隐私"
       }

docs/privacy.html

@@ -45,6 +45,7 @@
 
   <h2>Data retention</h2>
   <p>Settings and API keys remain on your device until you delete the app or reset settings. Transcription results are passed to the host app you are typing in and are not stored long-term by OSGKeyboard.</p>
+  <p><strong>Voice history</strong> — successful transcripts may be saved locally in the main app’s History tab for your convenience. This history stays on your device only, is never uploaded, and can be cleared at any time from History or by resetting settings.</p>
 
   <h2>Contact</h2>
   <p>Questions: open an issue at <a href="https://github.com/hkgood/OSGKeyboard">github.com/hkgood/OSGKeyboard</a>.</p>
@@ -81,6 +82,7 @@
 
   <h2>数据保留</h2>
   <p>设置与 API Key 保留在设备上，直至卸载或重置。识别结果写入你正在使用的宿主 App，OSGKeyboard 不会长期存储。</p>
+  <p><strong>语音历史</strong> — 成功的转写可能保存在主 App「历史」页，仅供本机查看，不会上传，可随时在历史页清空或通过重置设置清除。</p>
 
   <h2>联系</h2>
   <p>问题反馈：<a href="https://github.com/hkgood/OSGKeyboard">github.com/hkgood/OSGKeyboard</a></p>

docs/privacy/index.html

@@ -46,6 +46,7 @@
 
   <h2>Data retention</h2>
   <p>Settings and API keys remain on your device until you delete the app or reset settings. Transcription results are passed to the host app you are typing in and are not stored long-term by OSGKeyboard.</p>
+  <p><strong>Voice history</strong> — successful transcripts may be saved locally in the main app’s History tab for your convenience. This history stays on your device only, is never uploaded, and can be cleared at any time from History or by resetting settings.</p>
 
   <h2>Contact</h2>
   <p>Questions: open an issue at <a href="https://github.com/hkgood/OSGKeyboard">github.com/hkgood/OSGKeyboard</a>.</p>
@@ -82,6 +83,7 @@
 
   <h2>数据保留</h2>
   <p>设置与 API Key 保留在设备上，直至卸载或重置。识别结果写入你正在使用的宿主 App，OSGKeyboard 不会长期存储。</p>
+  <p><strong>语音历史</strong> — 成功的转写可能保存在主 App「历史」页，仅供本机查看，不会上传，可随时在历史页清空或通过重置设置清除。</p>
 
   <h2>联系</h2>
   <p>问题反馈：<a href="https://github.com/hkgood/OSGKeyboard">github.com/hkgood/OSGKeyboard</a></p>