Adds src/http-server.ts - a Node.js HTTP entry point that exposes the
MCP implementation via Streamable HTTP transport (POST/GET /mcp) per
the MCP 2025-11-25 specification.
- Uses StreamableHTTPServerTransport (stateless mode) from the MCP SDK
- Port configurable via MCP_PORT env var (default: 3000)
- ObsidianMCPServer.connect() now accepts an optional Transport param
so both stdio (existing) and HTTP (new) modes reuse the same server
- Added 'npm run server' script to start the HTTP server
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>