fix: add missing 'active' status to DatabaseExportResponse type

[SharanRP]

Description

Fixes #2669

The DatabaseExportResponse interface was missing the 'active' status option, causing TypeScript errors when users tried to check response.status == "active" during D1 database export polling.

Changes

• Added 'active' to the status union type in src/resources/d1/database.ts
• Before: status?: 'complete' | 'error';
• After: status?: 'complete' | 'error' | 'active';

Testing

• ✅ Created test case reproducing the original issue
• ✅ Verified TypeScript compilation passes with the fix
• ✅ No breaking changes to existing functionality

Issue Reference

This resolves the TypeScript error reported in #2669:

[github-actions[bot]]

This pull request hasn't been updated in a while, and is being marked as stale. Thanks!