Add Smithery integration to DumplingAI MCP server

[codegen-sh]

This PR adds Smithery integration to the DumplingAI MCP server, providing access to additional AI tools and capabilities.

Changes:

• Added @smithery/sdk dependency to package.json
• Added three new Smithery tools to the MCP server:
  1. smithery-sequential-thinking - Enhances reasoning with structured sequential thinking process
  2. smithery-brave-search - Performs web searches using Brave Search via Smithery
  3. smithery-browserbase - Automates browser interactions using Browserbase via Smithery

Usage:

To use these new tools, you'll need to set the SMITHERY_API_KEY environment variable with a valid Smithery API key.

Example:

export SMITHERY_API_KEY=your_smithery_api_key

Benefits:

• Enhanced reasoning capabilities with sequential thinking
• Alternative web search through Brave Search
• Browser automation for web interactions