feat: add archived column to notifications and implement archiving functionality

- Introduced an archived boolean column in the notifications table to allow users to archive inbox items without deletion.
- Updated Notification model to include the archived field with default value.
- Added ArchiveRequest and ArchiveResponse models for handling archive/unarchive operations.
- Implemented API endpoint to archive or unarchive notifications, ensuring real-time updates with Electric SQL.
- Enhanced InboxSidebar to filter and display archived notifications appropriately.

surfsense_web/contracts/types/inbox.types.ts

@@ -110,6 +110,7 @@ export const inboxItem = z.object({
 	title: z.string(),
 	message: z.string(),
 	read: z.boolean(),
+	archived: z.boolean().default(false),
 	metadata: z.record(z.string(), z.unknown()),
 	created_at: z.string(),
 	updated_at: z.string().nullable(),