Ship native iOS app, Wiki/TTS backend, and skeleton loading UX.

Replace the WebView shell with SwiftUI screens, add account-scoped Wiki and TTS APIs with adaptive review and photo scan support, and keep web/iOS pages usable while data loads asynchronously.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/config.py

@@ -17,6 +17,16 @@ class Settings(BaseSettings):
     mysql_password: str = "888888"
     mysql_database: str = "wordloop"
 
+    deepseek_api_key: str = ""
+    deepseek_base_url: str = "https://api.deepseek.com"
+    deepseek_model: str = "deepseek-chat"
+    ai_wiki_daily_llm_limit: int = 20
+
+    tkmind_tts_base_url: str = "https://asr.tkmind.cn"
+    tkmind_tts_enabled: bool = True
+    tkmind_tts_spk_id: str = "aitong"
+    tkmind_tts_timeout: int = 20
+
     @property
     def database_url(self) -> str:
         user = quote_plus(self.mysql_user)