Newsletter, AI, and Subscription Experience Update

📥 Newsletter Collection & Parsing

Fixed parsing issues with specific sender domains (e.g., @jamesclear.com) to improve the completeness of newsletter content.
Optimized email article extraction: titles are now parsed using web-based algorithms, and sender email addresses are automatically replaced with author names.
Fixed missing image issues caused by misapplied generic parsing logic.
Fixed a bug where some email items were not recorded properly.
Improved email parsing logic and reduced database load.

✨ AI & Language Support

Optimized AI prompt logic: now only triggers AI suggestions when no search results are found, without affecting basic search functionality.
Enhanced multilingual support: if the input is in an unsupported language, AI will respond in the app’s default language.

🛠 System & Subscription Fixes

Fixed an issue where Apple subscriptions were mistakenly canceled; now they are only revoked when no valid subscription is active.
Fixed a bug that allowed some users to access AI features on non-iOS platforms when they shouldn’t.