Summary

• Add received (boolean) and receivedOn (timestamp) columns to the document table
• New PATCH /volunteer/:id/doc/:type endpoint — marks a document as received/not received
• Expose received and receivedOn in the document DTO

Changes

• Migration: 1777303247669-add-document-received.ts
• document.entity.ts — new received + receivedOn fields
• dto-document.ts — serialise new fields
• volunteer-doc.schema.ts — new volunteerDocSchemaPatchBody schema
• doc.routes.ts — new PATCH /:type route

Endpoint

`PATCH /volunteer/:id/doc/:type`
Body: `{ "received": true }`

• Sets `received = true` and `receivedOn = NOW()`
• Sets `received = false` and clears `receivedOn` when false

SDK changes needed (local publish)

Add to `ApiDocumentGet`:
```ts
received: boolean;
receivedOn: Date | null;
```
Add new interface:
```ts
export interface ApiDocumentPatch {
received: boolean;
}
```

Closes

• Add document.received + PATCH /volunteer/:id/doc/:type endpoint #416

Unblocks

• FE PR fix: make arg optional again #351