Bulk appointment import package
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1. Edit appointments.xlsx (keep the header row).
2. Put one document per applicant in documents/, named exactly after passport_no:
     documents/AB1234567.pdf
     documents/CD7654321.jpg   (also .jpeg / .png)
3. Zip appointments.xlsx + documents/ and upload via Import ZIP.
4. Every row requires a matching document (pdf/jpg/jpeg/png).
   Validation is all-or-nothing: if anything fails, nothing is imported —
   fix and upload again.
