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… models (github#170)

* Add ArXiv MCP Server for academic research and paper analysis

Features:
• Search arXiv papers with advanced filtering (date, category, query)
• Download and store papers locally as markdown
• Read and analyze paper content programmatically
• Deep research analysis prompts for comprehensive paper review
• Configurable local storage path for paper management

Technical Details:
- Category: search (academic research focused)
- License: Apache 2.0 (compatible with Docker registry)
- Source: https://github.com/jasonleinart/arxiv-mcp-server
- Build Status: Successfully tested and validated
- Docker Image: mcp/arxiv-mcp-server

Target Users:
Perfect for researchers, academics, and AI assistants conducting
literature reviews, research analysis, and academic paper exploration.

Differentiates from existing paper-search server by providing:
- ArXiv-specific optimizations and direct API integration
- Local paper storage and management capabilities
- Research-focused analysis prompts and workflows
- Advanced filtering and categorization options

* FIX: Add proper volume mounting to ArXiv MCP server

- Maps user storage path to /app/papers inside container
- Enables file persistence for downloaded papers
- Fixes ephemeral container issue where files weren't saved
- Follows pattern used by kubectl-mcp-server and elevenlabs
- Essential for Docker MCP Toolkit volume mounting

* FIX: Use environment variable for volume mounting

- Change from parameter template to environment variable approach
- Docker MCP Toolkit processes  but not {{parameter}} templates
- Maps storage_path parameter to STORAGE_PATH env var for volume mounting
- Should resolve volume mounting issue where files weren't persisting

* FIX: Correct volume mounting configuration per PR feedback

- Change volume mapping from $STORAGE_PATH to {{arxiv-mcp-server.storage_path}} template syntax
- Add ARXIV_STORAGE_PATH environment variable for internal container path
- Fixes volume mounting issue identified by @cmrigney in PR review
- Follows Docker MCP Registry configuration standards per docs/configuration.md

* FIX: Apply reviewer's suggestion - Use only ARXIV_STORAGE_PATH environment variable

- Remove redundant STORAGE_PATH environment variable as suggested by @cmrigney
- Keep only ARXIV_STORAGE_PATH with '/app/papers' value for container internal path
- Simplifies configuration while maintaining full functionality
- Volume mounting handles path mapping: {{arxiv-mcp-server.storage_path}}:/app/papers
- ArXiv server auto-detects Docker environment and uses correct storage path

* Update ArXiv MCP Server with enhanced tool descriptions for local AI models

- Add enhanced tool descriptions optimized for local AI model compatibility
- Improve Docker MCP Gateway integration with detailed context
- Address community feedback about sparse tool descriptions causing confusion
- Add tags for better discoverability: local-models, docker-gateway, enhanced-descriptions

This update resolves issues where local AI models (Llama, Mistral, etc.) were
getting confused by minimal tool descriptions when using Docker MCP Gateway.

Fixes: docker/mcp-gateway#93