Build a URL Shortener API

Problem/Feature Description

Build a URL shortener service using Hono and TypeScript, targeting Node.js. The service should allow users to create short URLs and track click analytics.

Endpoints:

• POST /api/urls -- create a short URL (fields: originalUrl, customSlug optional)
• GET /api/urls -- list all shortened URLs with click counts
• GET /api/urls/:slug/stats -- get detailed stats for a URL (click count, last clicked)
• GET /:slug -- redirect to the original URL (302 redirect, increment click count)
• DELETE /api/urls/:slug -- delete a short URL

Business rules:

• Original URL must be a valid URL
• Custom slug must be alphanumeric, 3-20 characters
• If no custom slug, generate a random 6-character slug
• Slugs must be unique
• Track click count and last clicked timestamp

Use in-memory storage.

Output Specification

Produce:

• src/app.ts -- Hono application setup
• src/server.ts -- Node.js entry point
• src/routes/urls.ts -- URL management endpoints
• src/routes/redirect.ts -- redirect handler
• package.json -- with dependencies (no need to run npm install)
• src/app.test.ts -- basic tests for the API

You may create additional files as needed.