feat: Add audiobook generation feature, including new database files, image assets, and README updates.

README.md

@@ -13,6 +13,7 @@
 - Custom Voice: Predefined speaker voices
 - Voice Design: Create voices from natural language descriptions
 - Voice Cloning: Clone voices from uploaded audio
+- Audiobook Generation: Upload EPUB files and generate multi-character audiobooks with LLM-powered character extraction and voice assignment
 - Dual Backend Support: Switch between local model and Aliyun TTS API
 - Multi-language Support: English, 简体中文, 繁體中文, 日本語, 한국어
 - JWT auth, async tasks, voice cache, dark mode
@@ -33,6 +34,16 @@
   </tr>
 </table>
 
+### Audiobook Generation
+![Audiobook Overview](./images/audiobook-overview.png)
+
+<table>
+  <tr>
+    <td width="50%"><img src="./images/audiobook-characters.png" alt="Audiobook Characters" /></td>
+    <td width="50%"><img src="./images/audiobook-chapters.png" alt="Audiobook Chapters" /></td>
+  </tr>
+</table>
+
 ## Tech Stack
 
 **Backend**: FastAPI + SQLAlchemy + PyTorch + JWT

README.zh.md

@@ -13,6 +13,7 @@
 - 自定义语音：预定义说话人语音
 - 语音设计：自然语言描述创建语音
 - 语音克隆：上传音频克隆语音
+- 有声书生成：上传 EPUB 文件，通过 LLM 自动提取角色并分配语音，生成多角色有声书
 - 双后端支持：支持本地模型和阿里云 TTS API 切换
 - 多语言支持：English、简体中文、繁體中文、日本語、한국어
 - JWT 认证、异步任务、语音缓存、暗黑模式
@@ -33,6 +34,16 @@
   </tr>
 </table>
 
+### 有声书生成
+![有声书概览](./images/audiobook-overview.png)
+
+<table>
+  <tr>
+    <td width="50%"><img src="./images/audiobook-characters.png" alt="有声书角色列表" /></td>
+    <td width="50%"><img src="./images/audiobook-chapters.png" alt="有声书章节列表" /></td>
+  </tr>
+</table>
+
 ## 技术栈
 
 **后端**: FastAPI + SQLAlchemy + PyTorch + JWT