Build a Bookmark Manager API

Problem/Feature Description

Build a personal bookmark manager API using Hono and TypeScript, targeting Bun.

Endpoints:

• POST /api/bookmarks -- create a bookmark (fields: url, title, tags array, description optional)
• GET /api/bookmarks -- list all bookmarks, optionally filtered by tag via query param ?tag=
• GET /api/bookmarks/:id -- get a single bookmark
• PATCH /api/bookmarks/:id -- update a bookmark's title, tags, or description
• DELETE /api/bookmarks/:id -- delete a bookmark

Business rules:

• URL must be a valid URL and unique across all bookmarks
• Title is required and max 200 characters
• Tags must be an array of lowercase strings, max 10 tags
• Timestamps (createdAt, updatedAt) are set automatically

Use in-memory storage.

Output Specification

Produce:

• src/app.ts -- Hono application with middleware and routes
• src/index.ts -- Bun entry point
• src/routes/bookmarks.ts -- bookmark CRUD handlers
• src/schemas.ts -- Zod schemas for validation
• package.json -- with dependencies listed (no need to install)

You may create additional files as needed.