feat: add mcp-servers/**

mcp-servers/paper-search/.env.example

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+# MCP Paper Search Server Configuration
+# ====================================
+
+# MCP Service
+MCP_PAPER_SEARCH_VERSION=latest
+MCP_PAPER_SEARCH_PORT_OVERRIDE=8000
+
+# Timezone
+TZ=UTC

mcp-servers/paper-search/README.md

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+# Paper Search MCP Server
+
+Paper Search MCP Server provides research paper search and discovery capabilities through the Model Context Protocol.
+
+## Features
+
+- 🔍 **Paper Search** - Search research papers
+- 📊 **Advanced Filtering** - Filter papers by various criteria
+- 📥 **Paper Access** - Access paper information and metadata
+- 🔗 **Cross-reference** - Find related papers
+
+## Environment Variables
+
+| Variable                         | Default  | Description                    |
+| -------------------------------- | -------- | ------------------------------ |
+| `MCP_PAPER_SEARCH_VERSION`       | `latest` | MCP Paper Search image version |
+| `MCP_PAPER_SEARCH_PORT_OVERRIDE` | `8000`   | MCP service port               |
+| `TZ`                             | `UTC`    | Timezone                       |
+
+## Quick Start
+
+```bash
+docker compose up -d
+```

mcp-servers/paper-search/README.zh.md

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+# Paper Search MCP 服务器
+
+Paper Search MCP 服务器通过 Model Context Protocol 提供研究论文搜索和发现功能。
+
+## 功能特性
+
+- 🔍 **论文搜索** - 搜索研究论文
+- 📊 **高级过滤** - 按各种条件过滤论文
+- 📥 **论文访问** - 访问论文信息和元数据
+- 🔗 **交叉参考** - 查找相关论文
+
+## 环境变量
+
+| 变量                             | 默认值   | 说明                      |
+| -------------------------------- | -------- | ------------------------- |
+| `MCP_PAPER_SEARCH_VERSION`       | `latest` | MCP Paper Search 镜像版本 |
+| `MCP_PAPER_SEARCH_PORT_OVERRIDE` | `8000`   | MCP 服务端口              |
+| `TZ`                             | `UTC`    | 时区                      |
+
+## 快速开始
+
+```bash
+docker compose up -d
+```

mcp-servers/paper-search/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-paper-search:
+    <<: *default
+    image: mcp/paper-search:${MCP_PAPER_SEARCH_VERSION:-latest}
+    environment:
+      - MCP_HOST=0.0.0.0
+      - TZ=${TZ:-UTC}
+    ports:
+      - "${MCP_PAPER_SEARCH_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