feat: add voucher bulk code generation

[JacobCoffee]

Summary

• Add VoucherBulkConfig dataclass and generate_voucher_codes() service for bulk code generation with configurable prefix, type, count, and constraints
• Add management dashboard UI (VoucherBulkGenerateView) for bulk generating voucher batches with form validation
• Codes use cryptographically secure random generation via secrets.token_urlsafe with in-memory uniqueness checks and atomic bulk_create
• URL mounted at <conference>/vouchers/bulk/generate/ using separate urls_vouchers.py to avoid conflicts
• "Bulk Generate" button added to existing voucher list page

How to test in the UI

1. Start the dev server:

   uv run python examples/manage.py migrate
   uv run python examples/manage.py runserver

2. Log in as a superuser and navigate to the management dashboard
3. Go to Vouchers for any conference (/manage/<slug>/vouchers/)
4. Click the "Bulk Generate" button (next to "Add Voucher")
5. Fill in the form:
   • Prefix: SPEAKER- (or any prefix)
   • Count: 10
   • Type: Complimentary (100% off)
   • Leave other fields as defaults
6. Submit — you should be redirected to the voucher list with a success message showing "Successfully generated 10 voucher codes"
7. Verify 10 new vouchers appear in the list, each with code starting with SPEAKER-
8. Also try the existing "Add Voucher" button to create a single voucher — both flows should work independently

Test plan

• Bulk generate 10 comp vouchers with prefix "SPEAKER-" and verify all created
• Verify duplicate codes are prevented across batches
• Verify form validation (count must be 1-500, prefix required)
• Verify "Add Voucher" (single creation) still works alongside bulk
• Verify generated codes appear in the voucher list with correct type/discount

🤖 Generated with Claude Code

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[Copilot]

Pull request overview

Adds a management-dashboard workflow for bulk generating voucher codes for a conference, backed by a new registration service that creates voucher batches atomically.

Changes:

• Introduces VoucherBulkConfig and generate_voucher_codes() to generate batches of vouchers in a transaction.
• Adds a new management FormView + form + template for bulk generation.
• Mounts the new route under <conference>/vouchers/bulk/generate/ via a dedicated urls_vouchers.py.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/django_program/registration/services/voucher_service.py	New bulk voucher generation service + config dataclass and code generation logic.
src/django_program/manage/views_vouchers.py	New management view to render/validate the form and invoke the service.
src/django_program/manage/forms_vouchers.py	New form to collect batch generation parameters and optional constraints.
src/django_program/manage/templates/django_program/manage/voucher_bulk_generate.html	New dashboard template for bulk voucher generation.
src/django_program/manage/urls_vouchers.py	New URLConf for voucher bulk operations.
src/django_program/manage/urls.py	Mounts the voucher bulk URLConf under the conference-scoped voucher path.

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Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

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Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

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