docs: add new features

Author: jinzcdev

README.md

@@ -14,10 +14,11 @@ The LeetCode MCP Server is a [Model Context Protocol (MCP)](https://modelcontext
 
 ## Features
 
-- 🌐 **Multi-site Support**: Supports both leetcode.com and leetcode.cn platforms
-- 📊 **Problem Data Retrieval**: Obtain detailed problem descriptions, constraints, examples, and solution approaches
+- 🌐 **Multi-site Support**: Compatible with both leetcode.com (Global) and leetcode.cn (China)
+- 📊 **Problem Data Retrieval**: Obtain detailed problem descriptions, constraints, examples, official editorials, and ​user-submitted solutions
 - 👤 **User Data Access**: Retrieve user profiles, submission history, and contest performance
-- 🔍 **Advanced Search Capabilities**: Filter problems by tags, difficulty levels, and categories
+- 🔒 **​Private Data Access**: Create and query user notes, track problem-solving progress, and analyze submission details (AC/WA analysis)
+- 🔍 **Advanced Search Capabilities**: Filter problems by tags, difficulty levels, categories, and keywords
 - 📅 **Daily Challenge Access**: Easily access daily challenge problems
 
 ## Prerequisites

README_zh-CN.md

@@ -14,10 +14,11 @@ LeetCode MCP Server 是一个基于 [模型上下文协议 (MCP)](https://modelc
 
 ## 特性
 
-- 🌐 **多站点支持**：同时支持 `leetcode.com` 和 `leetcode.cn` 平台
-- 📊 ​**题目数据获取**：获取详细的题目描述、约束条件、示例和题解
+- 🌐 **多站点支持**：同时支持 `leetcode.com`（全球）和 `leetcode.cn`（中国）站点
+- 📊 ​**题目数据获取**：获取详细的题目描述、约束条件、示例、官方题解和用户提交的解答
 - 👤 **用户数据访问**：检索用户资料、提交历史和竞赛表现
-- 🔍 **高级搜索功能**：按标签、难度级别和分类筛选题目
+- 🔒 **私有数据访问**：创建和查询用户笔记，跟踪题目解答进度，分析提交详情（AC/WA 报告）
+- 🔍 **高级搜索功能**：按标签、难度级别、分类和关键字筛选题目
 - 📅 **每日一题获取**：轻松访问每日一题
 
 ## 前提条件