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/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>