Implemented additional options and features for vouchers

[Sana0523]

@mariobehling
Implemented additional options and features for vouchers as per requirement.

Issue fix: #676

If you encounter an Internal Server Error due to model migrations, please run:

docker exec -it eventyay-ticket python pretix/src/manage.py makemigrations pretixbase
docker exec -it eventyay-ticket python pretix/src/manage.py migrate

Summary by Sourcery

Introduce new voucher options and features including minimum usage limits, free add-ons, bundled item inclusion, exhibitor association, and exhibitor comments; update forms, detail view, and listing templates to surface these fields.

New Features:

• Add minimum usages limit for vouchers
• Add free add-ons option for vouchers
• Add include bundled items flag for vouchers
• Allow associating an exhibitor and comment with a voucher

Enhancements:

• Expose new voucher fields in the listing table
• Update voucher creation and detail forms to include new options

[sourcery-ai]

Reviewer's Guide

This PR adds new voucher configuration options—minimum usages, free add‐ons, bundled inclusion—and supports assigning vouchers to exhibitors with comments, updating both the backend form definitions and the UI templates to reflect and manage these options.

Class diagram for updated Voucher form fields

classDiagram
    class VoucherForm {
        +minimum_usages: Integer
        +free_addons: Boolean
        +include_bundled: Boolean
        +exhibitor: String
        +exhibitor_comment: String
    }

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File-Level Changes

Change	Details	Files
Extended the vouchers list view to display new voucher attributes.	Added table header columns for minimum usages, free add‐ons, bundled inclusion, and exhibitor Rendered voucher.minimum_usages in its own cell Displayed free_addons and include_bundled as yes/no labels Shown exhibitor name with optional comment in a nested small text	src/pretix/control/templates/pretixcontrol/vouchers/index.html
Updated the VoucherForm to include the new fields in its Meta definition.	Inserted minimum_usages, free_addons, include_bundled, exhibitor, and exhibitor_comment into the fields list Ensured these new fields are included in both form definitions	src/pretix/control/forms/vouchers.py
Enhanced the voucher detail template to expose new settings and exhibitor assignment.	Added bootstrap fields for minimum_usages, free_addons, and include_bundled under Advanced settings Created a new Exhibitor fieldset with exhibitor and exhibitor_comment inputs	src/pretix/control/templates/pretixcontrol/vouchers/detail.html

Possibly linked issues

• Implement Additional Options for Vouchers #676: The PR implements the additional options and features for vouchers requested in the issue.

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[sourcery-ai]

Hey @Sana0523 - I've reviewed your changes - here's some feedback:

• Please include the generated migration file for these new voucher fields in the PR instead of asking users to run makemigrations manually.
• Add a min_value validator (and possibly help_text) to the minimum_usages field to prevent negative values and improve UX.
• Consider renaming or adding help_text to the “Include bundled” label so it’s clear which bundled items are being included.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- Please include the generated migration file for these new voucher fields in the PR instead of asking users to run makemigrations manually.
- Add a min_value validator (and possibly help_text) to the minimum_usages field to prevent negative values and improve UX.
- Consider renaming or adding help_text to the “Include bundled” label so it’s clear which bundled items are being included.

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[mariobehling]

@Sana0523 Thanks, we will review it. Could you please use a full screen capture tool, e.g. a Chrome plugin in future. This way it will be easier to see the whole page. Thank you!

[Saksham-Sirohi]

These changes appear not to be working, even after trying the migrate command. I still see an internal server error

[Sana0523]

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These changes appear not to be working, even after trying the migrate command. I still see an internal server error

@Saksham-Sirohi I'll look into the error from my end and get back.
Thank you.