fix(api): update api's for sponosrs

[Sak1012]

Summary by Sourcery

Bug Fixes:

• Mark created sponsor groups to be shown on the front page so they are no longer omitted from front-page displays.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Ensures newly resolved sponsor groups are configured to be visible on the front page by default when created via the API.

Sequence diagram for sponsor group resolution with front page visibility

sequenceDiagram
    actor Organizer
    participant Frontend
    participant ExhibitionAPI
    participant SponsorGroupService

    Organizer->>Frontend: Create sponsor with sponsor_group_name
    Frontend->>ExhibitionAPI: POST /sponsors
    ExhibitionAPI->>ExhibitionAPI: _resolve_sponsor_group(sponsor_group_name, sponsor_group_level)
    ExhibitionAPI->>SponsorGroupService: get_or_create(event, name, level, show_on_front_page=True)
    SponsorGroupService-->>ExhibitionAPI: SponsorGroup
    ExhibitionAPI-->>Frontend: Response including sponsor_group.show_on_front_page = true
    Frontend-->>Organizer: Sponsor shown as visible on front page

Loading

File-Level Changes

Change	Details	Files
Set newly created sponsor groups to be shown on the front page by default during sponsor group resolution.	Extend sponsor group creation parameters to include show_on_front_page flag Hard-code show_on_front_page to True when creating a sponsor group in _resolve_sponsor_group	exhibition/api.py

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[sourcery-ai]

Hey - I've left some high level feedback:

• Hardcoding show_on_front_page=True in _resolve_sponsor_group removes flexibility for callers that might want non-front-page sponsor groups; consider passing this as a parameter or deriving it from the context instead.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Hardcoding `show_on_front_page=True` in `_resolve_sponsor_group` removes flexibility for callers that might want non-front-page sponsor groups; consider passing this as a parameter or deriving it from the context instead.

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[Copilot]

Pull request overview

This pull request updates the exhibition API behavior when auto-creating a SponsorGroup from ExhibitorInfoSerializer by explicitly marking newly created sponsor groups as visible on the event front page.

Changes:

• Set show_on_front_page=True when creating a new SponsorGroup inside _resolve_sponsor_group.

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