Enforce standalone workshop signup capacity on participant join paths

[Copilot]

Standalone workshop signup limits were not enforced for participant registration, allowing over-capacity joins. This change adds capacity checks to both participant join flows so registration is rejected once active seats are exhausted.

• Capacity enforcement in join endpoints

  • Added MaxParticipants guard to:
    • POST /participants/standalone-workshops/{StandaloneWorkshopId}/join
    • POST /participants/standalone-workshops/join (short code path)
  • Capacity is computed from active registrations only (Status == Registered && WithdrawnAt == null), matching existing analytics semantics.
  • Existing idempotent behavior is preserved for users already actively registered.

• Behavioral coverage for full workshops

  • Added integration tests for both join paths to verify a second user receives 400 when workshop capacity is already full.

var registeredCount = await sql.Queryable<ActivityRegistration>()
    .CountAsync(r =>
        r.ActivityId == workshop.Id &&
        r.Status == ActivityRegistrationStatus.Registered &&
        r.WithdrawnAt == null, ct);

if (registeredCount >= workshop.MaxParticipants)
{
    AddError("Workshop is full");
    await Send.ErrorsAsync(400, ct);
    return;
}

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[Copilot]

Pull request overview

This PR adds standalone workshop capacity enforcement to the participant “join” endpoints, aligning seat counting with existing analytics semantics (active registrations only) and adding integration coverage for the “workshop full” behavior.

Changes:

• Added capacity checks to both standalone workshop participant join flows (ID-based and short-code based).
• Capacity is computed from active registrations only (Status == Registered && WithdrawnAt == null) to match analytics.
• Added integration tests ensuring a second distinct user receives 400 BadRequest when capacity is exhausted.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
GeeksHackingPortal.Api/Endpoints/Participants/StandaloneWorkshops/Join/Endpoint.cs	Adds capacity guard to the standard participant join route.
GeeksHackingPortal.Api/Endpoints/Participants/StandaloneWorkshops/JoinByShortCode/Endpoint.cs	Adds the same capacity guard to the short-code join route.
GeeksHackingPortal.Tests/Endpoints/Participants/StandaloneWorkshops/StandaloneWorkshopJoinAndStatusTests.cs	Adds integration tests asserting 400 when a second user attempts to join a full workshop via both join paths.

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