refactor: skills 目录扁平化，移除分类子目录

- 将 00-元技能、01-AI工具、02-数据库、03-加密货币、04-开发工具、05-生产力 下的技能移至 skills/ 根目录
- 更新 skills/README.md 使用表格进行说明性分类
- 更新 AGENTS.md 目录结构说明

skills/twscrape/references/installation.md

@@ -0,0 +1,66 @@
+# Installation
+
+## Standard Installation
+
+```bash
+pip install twscrape
+```
+
+## Development Version
+
+Install the latest development version directly from GitHub:
+
+```bash
+pip install git+https://github.com/vladkens/twscrape.git
+```
+
+## Requirements
+
+- Python 3.7+
+- asyncio support
+- Internet connection for Twitter/X access
+
+## Dependencies
+
+The library automatically installs required dependencies:
+- `httpx` - Async HTTP client
+- `aiosqlite` - Async SQLite database
+- Additional dependencies as specified in setup.py
+
+## Verification
+
+Verify installation:
+
+```bash
+# Check CLI is available
+twscrape --help
+
+# Check Python import works
+python -c "from twscrape import API; print('OK')"
+```
+
+## Upgrading
+
+```bash
+pip install --upgrade twscrape
+```
+
+## Uninstallation
+
+```bash
+pip uninstall twscrape
+```
+
+## Database Location
+
+By default, twscrape creates `accounts.db` in your current working directory. You can specify a custom location:
+
+```python
+api = API("path/to/custom.db")
+```
+
+Or via CLI:
+
+```bash
+twscrape --db path/to/custom.db <command>
+```