Implement set pricing options at global_setting

[odkhang]

This PR related to issue #381
New Features:

• Add a new field 'ticket_fee_percentage' to the global settings form, allowing users to set a percentage fee for each ticket sold.

[sourcery-ai]

Reviewer's Guide by Sourcery

The PR adds a new decimal field to the global settings form to allow setting a ticket fee percentage. The implementation extends the existing form fields using an OrderedDict to maintain field order.

Class diagram for updated global settings form

classDiagram
    class GlobalSettingsForm {
        +DecimalField ticket_fee_percentage
    }
    note for GlobalSettingsForm "A new field 'ticket_fee_percentage' has been added to set a percentage fee for each ticket sold."

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File-Level Changes

Change	Details	Files
Added a new ticket fee percentage field to the global settings form	Created a new DecimalField with label 'Ticket fee percentage' Added help text explaining that the fee will be charged per ticket sold Set the field as optional (required=False) Added validation to ensure the percentage is non-negative Appended the new field to existing form fields using OrderedDict to preserve order	src/pretix/control/forms/global_settings.py

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[odkhang]

[sourcery-ai]

Hey @odkhang - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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