feat: add mcp-servers/**

mcp-servers/markdownify/.env.example

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+# MCP Markdownify Server Configuration
+# ====================================
+
+# MCP Service
+MCP_MARKDOWNIFY_VERSION=latest
+MCP_MARKDOWNIFY_PORT_OVERRIDE=8000
+
+# Timezone
+TZ=UTC

mcp-servers/markdownify/README.md

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+# Markdownify MCP Server
+
+Markdownify MCP Server converts various document formats to Markdown through the Model Context Protocol.
+
+## Features
+
+- 📄 **Format Conversion** - Convert documents to Markdown
+- 🔗 **URL Processing** - Convert web content to Markdown
+- 📋 **Document Parsing** - Parse and convert various file types
+
+## Environment Variables
+
+| Variable                        | Default  | Description                   |
+| ------------------------------- | -------- | ----------------------------- |
+| `MCP_MARKDOWNIFY_VERSION`       | `latest` | MCP Markdownify image version |
+| `MCP_MARKDOWNIFY_PORT_OVERRIDE` | `8000`   | MCP service port              |
+| `TZ`                            | `UTC`    | Timezone                      |
+
+## Quick Start
+
+```bash
+docker compose up -d
+```

mcp-servers/markdownify/README.zh.md

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+# Markdownify MCP 服务器
+
+Markdownify MCP 服务器通过 Model Context Protocol 将各种文档格式转换为 Markdown。
+
+## 功能特性
+
+- 📄 **格式转换** - 将文档转换为 Markdown
+- 🔗 **URL 处理** - 将网页内容转换为 Markdown
+- 📋 **文档解析** - 解析和转换各种文件类型
+
+## 环境变量
+
+| 变量                            | 默认值   | 说明                     |
+| ------------------------------- | -------- | ------------------------ |
+| `MCP_MARKDOWNIFY_VERSION`       | `latest` | MCP Markdownify 镜像版本 |
+| `MCP_MARKDOWNIFY_PORT_OVERRIDE` | `8000`   | MCP 服务端口             |
+| `TZ`                            | `UTC`    | 时区                     |
+
+## 快速开始
+
+```bash
+docker compose up -d
+```

mcp-servers/markdownify/docker-compose.yaml

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+x-default: &default
+  restart: unless-stopped
+  logging:
+    driver: json-file
+    options:
+      max-size: 100m
+      max-file: "3"
+
+services:
+  mcp-markdownify:
+    <<: *default
+    image: mcp/markdownify:${MCP_MARKDOWNIFY_VERSION:-latest}
+    environment:
+      - MCP_HOST=0.0.0.0
+      - TZ=${TZ:-UTC}
+    ports:
+      - "${MCP_MARKDOWNIFY_PORT_OVERRIDE:-8000}:8000"
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "-q", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+    deploy:
+      resources:
+        limits:
+          cpus: '1.00'
+          memory: 512M
+        reservations:
+          cpus: '0.25'
+          memory: 128M