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/ccxt/references/specification.md

@@ -1,44 +0,0 @@
-# Ccxt - Specification
-
-**Pages:** 2
-
----
-
-## Search code, repositories, users, issues, pull requests...
-
-**URL:** https://github.com/ccxt/ccxt/wiki/Requirements
-
-**Contents:**
-- CCXT Integration Requirements
-- Public API
-    - Exchange Information, Fee Schedule and Trading Rules
-    - Market Data
-- Private API
-    - Trading
-    - Trading History
-    - Funding
-
-The exchange is required to implement the following list of methods and structures in order to get integrated with CCXT.
-
-(If the page is not being rendered for you, you can refer to the mirror at https://docs.ccxt.com/)
-
----
-
-## Search code, repositories, users, issues, pull requests...
-
-**URL:** https://github.com/ccxt/ccxt/wiki/Certification
-
-**Contents:**
-- CCXT Certification Program ·
-- Requirements
-- Contact Us
-
-The structure of CCXT defines a good, portable and cross-compatible standard for exchanges' API interfaces, that is implemented in the CCXT Unified API. Exchanges are welcome to apply for our certification program. Certification is technically supervised and quality-assured by members of the CCXT Dev Team. That implies that an exchange having a "certified" badge is properly implemented and tested by the authors of CCXT. Certification means less bugs, more functionality, priority support and a much more stable and efficient implementation in general.
-
-Getting integrated and certified requires the exchange to implement a quality API. Please, see the full list of technical requirements here: https://github.com/ccxt/ccxt/wiki/Requirements
-
-For inquiries on getting your exchange integrated, listed and certified: info@ccxt.trade
-
-(If the page is not being rendered for you, you can refer to the mirror at https://docs.ccxt.com/)
-
----