Add dev scripts for mitmproxy debugging and fix JSON-RPC error responses

- Add dev-with-mitm.sh for TUI-based traffic inspection
- Add dev-with-mitmweb.sh for web UI-based traffic inspection
- Fix missing 'id' field in JSON-RPC error responses (required by spec)
- Migrate from zod-to-json-schema to Zod v4's native z.toJSONSchema()

The mitmproxy scripts help developers debug MCP traffic by running
the server through a reverse proxy that intercepts all client requests.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

dev-with-mitmweb.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# Easy script to run MCP server with mitmproxy web interface
+
+echo "🚀 Starting MCP server with mitmproxy web UI..."
+echo ""
+echo "This will:"
+echo "  1. Start your MCP server on port 3232"
+echo "  2. Start mitmproxy with web UI on port 8081"
+echo "  3. Proxy client traffic through port 8080"
+echo ""
+echo "📡 Connect your MCP client to: http://localhost:8080/mcp"
+echo "🌐 View traffic in browser at: http://localhost:8081"
+echo ""
+echo "Press Ctrl+C to stop both processes"
+echo ""
+
+# Trap Ctrl+C to kill both processes
+trap 'kill 0' EXIT
+
+# Start the MCP server in background
+npm run dev &
+SERVER_PID=$!
+
+# Give server time to start
+sleep 3
+
+# Start mitmweb in reverse proxy mode
+mitmweb --mode reverse:http://localhost:3232 --listen-port 8080 --web-port 8081
+
+# This line won't be reached until mitmweb exits
+wait