feat: add mcp-servers/**

mcp-servers/fetch/README.md

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+# Fetch MCP Server
+
+Fetch MCP Server provides URL fetching and content extraction capabilities through the Model Context Protocol.
+
+## Features
+
+- 🔗 **URL Fetching** - Fetch content from URLs
+- 📝 **Markdown Extraction** - Extract markdown from web pages
+- 📄 **HTML Processing** - Process HTML content
+- 🌐 **Internet Access** - Access internet resources
+
+## Environment Variables
+
+| Variable                  | Default  | Description             |
+| ------------------------- | -------- | ----------------------- |
+| `MCP_FETCH_VERSION`       | `latest` | MCP Fetch image version |
+| `MCP_FETCH_PORT_OVERRIDE` | `8000`   | MCP service port        |
+| `TZ`                      | `UTC`    | Timezone                |
+
+## Quick Start
+
+```bash
+docker compose up -d
+```