MCP server skeleton wrapping REST API

[danielpmichalski]

Bootstrap the MCP server using Hono on Bun. Server wraps the REST API — no direct DB access.

• MCP protocol handler
• API key auth passthrough to REST API
• Tool registration scaffold

Acceptance criteria:

• MCP server starts with bun run dev in /mcp
• All REST API calls go through HTTP (no direct DB/GDrive access)
• Tool list endpoint returns registered tools

[danielpmichalski]

MCP server skeleton implemented in /mcp. Starts with bun run dev, all REST calls go via HTTP client in src/client.ts, tool list endpoint returns 8 registered tools.