feat: upgrade to rust-mcp-sdk 0.8, add multi-protocol fallback, icons, and task capability support

[hashemix]

📌 Summary

This PR upgrades the project to the latest rust-mcp-sdk ecosystem (v0.8.1 SDK) and brings mcp-discovery up to date with the newest MCP protocol features.

✨ Changes Made

• Introduced try_launch_mcp_server() that attempts protocol versions in order:
  2025_11_25 → 2025_06_18 → 2025_03_26.
• Falls back gracefully if a server doesn't support the latest protocol, with clear console feedback.
• Added detection and display of new task-related capabilities
• Updated client initialization with full modern ClientCapabilities (elicitation, roots, sampling, tasks)
• Console summary now shows server title, description, and website URL when available
• Added icon_image Handlebars helper to render tool/server icons
• HTML documentation output now includes tool icons in the tools table and better styling for supported/unsupported capabilities

🛠️ Testing Steps

💡 Additional Notes