feat: add mcp-servers/**

mcp-servers/arxiv-mcp-server/.env.example

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+# MCP ArXiv Server Configuration
+# =============================
+
+# MCP Service
+MCP_ARXIV_VERSION=latest
+MCP_ARXIV_PORT_OVERRIDE=8000
+
+# ArXiv Storage
+ARXIV_STORAGE_PATH=/data/papers
+
+# Timezone
+TZ=UTC

mcp-servers/arxiv-mcp-server/README.md

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+# ArXiv MCP Server
+
+ArXiv MCP Server provides a comprehensive bridge between AI assistants and arXiv's research repository through the Model Context Protocol.
+
+## Features
+
+- 🔍 **Paper Search** - Search arXiv papers with advanced filtering
+- 📥 **Paper Download** - Download and convert papers to markdown
+- 📖 **Paper Reading** - Read and analyze paper content
+- 🔬 **Research Analysis** - Deep research analysis capabilities
+- 💾 **Local Storage** - Local paper management and storage
+
+## Environment Variables
+
+| Variable                  | Default        | Description             |
+| ------------------------- | -------------- | ----------------------- |
+| `MCP_ARXIV_VERSION`       | `latest`       | MCP ArXiv image version |
+| `MCP_ARXIV_PORT_OVERRIDE` | `8000`         | MCP service port        |
+| `ARXIV_STORAGE_PATH`      | `/data/papers` | Papers storage path     |
+| `TZ`                      | `UTC`          | Timezone                |
+
+## Quick Start
+
+```bash
+docker compose up -d
+```

mcp-servers/arxiv-mcp-server/README.zh.md

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+# ArXiv MCP 服务器
+
+ArXiv MCP 服务器通过 Model Context Protocol 提供与 arXiv 研究库之间的全面桥接。
+
+## 功能特性
+
+- 🔍 **论文搜索** - 使用高级过滤搜索 arXiv 论文
+- 📥 **论文下载** - 下载并将论文转换为 Markdown
+- 📖 **论文阅读** - 读取和分析论文内容
+- 🔬 **研究分析** - 深层研究分析功能
+- 💾 **本地存储** - 本地论文管理和存储
+
+## 环境变量
+
+| 变量                      | 默认值         | 说明               |
+| ------------------------- | -------------- | ------------------ |
+| `MCP_ARXIV_VERSION`       | `latest`       | MCP ArXiv 镜像版本 |
+| `MCP_ARXIV_PORT_OVERRIDE` | `8000`         | MCP 服务端口       |
+| `ARXIV_STORAGE_PATH`      | `/data/papers` | 论文存储路径       |
+| `TZ`                      | `UTC`          | 时区               |
+
+## 快速开始
+
+```bash
+docker compose up -d
+```

mcp-servers/arxiv-mcp-server/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-arxiv:
+    <<: *default
+    image: mcp/arxiv-mcp-server:${MCP_ARXIV_VERSION:-latest}
+    environment:
+      - ARXIV_STORAGE_PATH=${ARXIV_STORAGE_PATH:-/data/papers}
+      - MCP_HOST=0.0.0.0
+      - TZ=${TZ:-UTC}
+    ports:
+      - "${MCP_ARXIV_PORT_OVERRIDE:-8000}:8000"
+    volumes:
+      - arxiv_data:/data/papers
+    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
+
+volumes:
+  arxiv_data:
+    driver: local