Make Exhibitors unique to event

[Sak1012]

This PR has fixes

• The Exhibitor List View properly fetch exhibitors unique to the event by adding get_queryset()
• Fixes bugs:
  • Add missing import for messages from django.contrib to properly show success messages
  • Add missing import for generate_booth_id from models

Summary by Sourcery

Scope exhibitor list view to the event, restore missing imports, and refine settings persistence and messaging

Bug Fixes:

• Add missing import for generate_booth_id
• Correct messages.success call to use the view’s request object

Enhancements:

• Limit exhibitor listings to the current event by overriding get_queryset
• Capture the created flag when retrieving or creating exhibitor settings

[sourcery-ai]

Reviewer's Guide

This PR enhances the ExhibitorListView to only fetch exhibitors for the current event and resolves import and minor logic bugs in the SettingsView post handler.

File-Level Changes

Change	Details	Files
Filter exhibitors by current event	Add get_queryset override filtering by self.request.event	exhibitors/views.py
Add missing imports	Import generate_booth_id from models Import messages from django.contrib	exhibitors/views.py
Improve SettingsView post handling	Capture ‘created’ flag from get_or_create instead of using a throwaway underscore Use self.request in messages.success to ensure correct request context	exhibitors/views.py

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[sourcery-ai]

Hey @Sak1012 - I've reviewed your changes and they look great!

Here's what I looked at during the review

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

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