refactor: 重构目录结构以支持 i18n

创建 'i18n' 目录以存放多语言内容。将所有现有的中文内容（文档、提示词、技能、README）移动到 'i18n/zh/' 中。添加了新的根 README 作为语言入口，并为英文（'en'）翻译创建了占位符结构。

skills/twscrape/references/index.md

@@ -1,39 +0,0 @@
-# twscrape Reference Documentation
-
-## Overview
-
-This directory contains detailed reference documentation for twscrape, a Python library for scraping Twitter/X data.
-
-## Reference Files
-
-### Core Documentation
-- **[installation.md](installation.md)** - Installation instructions and dependencies
-- **[api_methods.md](api_methods.md)** - Complete API method reference with parameters
-- **[account_management.md](account_management.md)** - Account setup, login, and rotation
-- **[cli_usage.md](cli_usage.md)** - Command-line interface guide
-- **[proxy_config.md](proxy_config.md)** - Proxy configuration and setup
-- **[examples.md](examples.md)** - Practical code examples and patterns
-
-## Quick Navigation
-
-### Getting Started
-1. Read [installation.md](installation.md) for setup
-2. Review [account_management.md](account_management.md) for adding accounts
-3. Check [examples.md](examples.md) for quick start code
-
-### API Reference
-- For programmatic usage: [api_methods.md](api_methods.md)
-- For command-line usage: [cli_usage.md](cli_usage.md)
-
-### Advanced Topics
-- Proxy configuration: [proxy_config.md](proxy_config.md)
-- Rate limit handling: See [api_methods.md](api_methods.md#rate-limits)
-
-## Key Features
-
-- ✅ Async/await support for parallel operations
-- ✅ Automatic account rotation
-- ✅ Session persistence
-- ✅ Multiple proxy support
-- ✅ SNScrape-compatible data models
-- ✅ Both CLI and Python API