File Metadata Service

Build a Fastify API that manages file upload metadata. The service tracks files uploaded by users -- it does not handle the actual binary upload, just the metadata records.

A file record has: id (UUID string), filename (string), mimeType (string), sizeBytes (integer), uploadedBy (string -- user ID), status ("pending", "processing", "ready", "failed"), and createdAt (ISO date string).

Endpoints

• POST /api/files -- Register a new file upload. Accepts filename, mimeType, sizeBytes, and uploadedBy.
• GET /api/files -- List files. Accepts optional query params: uploadedBy (string), status (string), mimeType (string).
• GET /api/files/:id -- Get file details.
• PATCH /api/files/:id/status -- Update file processing status. Accepts status in the body.
• DELETE /api/files/:id -- Delete a file record.
• POST /api/files/webhook -- Receive processing completion webhooks from an external file processor. Accepts fileId, status ("ready" or "failed"), and optional error (string).

Use an in-memory store.

Output

Produce TypeScript files in a src/ directory:

• src/app.ts -- Fastify app setup
• src/plugins/files.ts -- File management routes
• src/plugins/webhook.ts -- Webhook receiver routes
• src/services/fileService.ts -- File business logic
• src/server.ts -- Server startup

Do not include test files or build configuration.