Add ticket buying option into creation wizard

[lcduong]

This PR resolves #374

Add ticket buying option into creation wizard

Summary by Sourcery

New Features:

• Introduce a new option in the event creation wizard to require registered accounts for ticket purchases.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds a new ticket buying option in the event creation wizard that allows event organizers to require registered accounts for ticket purchases. The implementation includes UI changes to the quick setup form, form field definition, and the corresponding backend logic to save this setting.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added new ticket buying settings section in the quick setup wizard	Added a new fieldset with a ticket buying settings section Included a form field for requiring registered accounts Added appropriate icon and styling consistent with existing sections	src/pretix/control/templates/pretixcontrol/event/quick_setup.html
Implemented form field definition for registered account requirement	Added new BooleanField for require_registered_account_for_tickets Added descriptive label and help text explaining the feature	src/pretix/control/forms/event.py
Added backend logic to handle the new setting	Set default value to True in get_initial Added logic to save the setting in form_valid method Integrated with event settings system	src/pretix/control/views/event.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#374	Add ticket buying option to require registered accounts in the event creation wizard	✅
#374	Place the option below 'Create ticket type' and above 'Features'	✅
#374	Activate the option by default	✅

Possibly linked issues

• Add ticket buying option into creation wizard #374: The PR adds the ticket buying option as requested in the issue, fulfilling its requirements.
• Add ticket buying option into creation wizard #374: PR implements the feature to require registered accounts, addressing the issue's request for this option.
• Add ticket buying option into creation wizard #374: PR adds option to require registered accounts, addressing the issue's need for account requirement.

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[sourcery-ai]

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

Overall Comments:

• Consider setting require_registered_account_for_tickets to False by default, as forcing account creation could be too restrictive for many events. Let organizers opt-in to this restriction rather than having to opt-out.
• The settings handling is inconsistent - require_registered_account_for_tickets is saved directly while other settings use the general settings mechanism. Consider using the standard settings approach for consistency.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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