Flatten skill category directory structure

audio-creation/audiobook/references/characters-example.md

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+# Character List
+
+## Major Characters (dialogue > 5 lines)
+1. **Alice** - Female protagonist, 22 years old, warm and gentle personality
+2. **Bob** - Male protagonist, 20 years old, outgoing and direct
+
+## Minor Characters (dialogue 1-5 lines)
+3. **The Boss** - Middle-aged male, authoritative tone
+4. **The Clerk** - Young female, friendly
+
+## Narrator
+- Third-person omniscient perspective
+- Tone: calm and composed, storytelling quality
+
+---
+
+## Usage
+
+This file is used in **Phase 1 (Text Analysis)** to record characters identified from the text.
+
+In **Phase 3 (Voice Preview)**, `get_voice_id` will be called to fetch voice candidates based on:
+- **Narrator**: storyteller type, calm
+- **Alice**: female, young, warm/gentle
+- **Bob**: male, young, energetic/direct
+- **Minor characters**: reuse similar voices to major characters if needed
+
+---
+
+## Chinese Example (中文示例)
+
+## 主要角色（对话 > 5句）
+1. **小雨** - 女主角，22岁，温柔善良
+2. **阿明** - 男主角，20岁，开朗直接
+
+## 次要角色（对话 1-5句）
+3. **老板** - 中年男性，权威口吻
+4. **店员** - 年轻女性，友好亲切
+
+## 旁白
+- 第三人称全知视角
+- 语气：平静从容，叙事感