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/.env.example

@@ -6,3 +6,16 @@ MYSQL_PASSWORD=888888
 MYSQL_DATABASE=wordloop
 
 WORDLOOP_SECRET_KEY=wordloop-dev-secret-change-in-production
+
+# Wiki（DeepSeek，OpenAI 兼容接口）
+DEEPSEEK_API_KEY=
+DEEPSEEK_BASE_URL=https://api.deepseek.com
+DEEPSEEK_MODEL=deepseek-chat
+AI_WIKI_DAILY_LLM_LIMIT=20
+
+# 单词整词朗读（ThinkMind CosyVoice）
+# 本地开发连公网网关；生产部署（同机 CosyVoice）用 http://127.0.0.1:19200
+TKMIND_TTS_BASE_URL=https://asr.tkmind.cn
+TKMIND_TTS_ENABLED=true
+TKMIND_TTS_SPK_ID=aitong
+# TKMIND_TTS_TIMEOUT=20