Feat: Add Model Context Protocol (MCP) server to Next.js dev server (#84100)
This PR integrates an MCP server into the Next.js development server at
`/_next/mcp`, enabling AI agents to programmatically interact with
Next.js projects. We're including an initial `get_project_path.` tool as
an example that returns the project's absolute path - this serves as a
starting point to demonstrate how tools can expose project information
to MCP clients, with plans to expand the available tools for richer
AI-assisted development experiences.