Build a Notes API for Cloudflare Workers

Problem/Feature Description

Build a simple notes API using Hono and TypeScript, deployed as a Cloudflare Worker with KV storage for persistence.

Endpoints:

• POST /api/notes -- create a note (fields: title, content, tags array optional)
• GET /api/notes -- list all notes (returns metadata only: id, title, tags, createdAt)
• GET /api/notes/:id -- get a full note including content
• PUT /api/notes/:id -- replace a note
• DELETE /api/notes/:id -- delete a note

The Worker has a KV namespace binding called NOTES_KV. Use it for storage:

• Store notes as JSON values with the note ID as the key
• For listing, maintain a separate notes:index key with an array of note metadata

Business rules:

• Title is required, 1-200 characters
• Content is required, max 10000 characters
• Tags must be lowercase strings, max 5 tags
• IDs are auto-generated UUIDs

Output Specification

Produce:

• src/index.ts -- Cloudflare Worker entry point
• src/app.ts -- Hono application
• src/routes/notes.ts -- note route handlers
• wrangler.toml -- Cloudflare Worker configuration with KV binding
• package.json -- with dependencies (no need to install)

You may create additional files as needed.