Optimization of newsletters, AI, membership, etc.

📥 Newsletter collection and analysis

Fixed abnormal parsing issues with some email sources (such as newsletter@caixin.cn, james@jamesclear.com, etc.), and improved the integrity of newsletter content;
Optimized email article extraction, the title information is analyzed according to the web page algorithm, and the sender's email address is automatically replaced with the author's name;
Fixed the problem of missing email images to prevent the generic article solution from being applied incorrectly to special emails;
Fixed an issue where some email recording records were lost;
Optimized the parsing logic for email communication and optimized the database load.

✨ AI and language support

AI questioning logic optimization: only alerts when search results are empty, without affecting the use of basic search functions;
AI multi-language support update: If it is recognized that the language is not supported, it will respond in the client's language.

🛠 System and subscription fixes

Fixed an issue with abnormal Apple subscription cancellations to ensure that membership status is only canceled if there is no current active subscription;
Fixed an exception when some users tried AI features on non-iOS clients.