Add Bulk QR Code Generator for Excel and CSV

[kenchikuliu]

Adds Bulk QR Code Generator for Excel and CSV under a new Batch Generators subsection of Apps.

Why it is awesome:

• Built for spreadsheet workflows: upload Excel or CSV rows and generate a batch at once.
• Supports export formats useful for operations teams: ZIP, PDF, and SVG.
• Works without signup for the core free batch flow.
• Differentiates from generic single-code generators by focusing on bulk spreadsheet import/export.

Checks:

• GITHUB_TOKEN="$(gh auth token)" npm run lint
• git diff --check