Fix UseAdminApiKey() not updating ApiKeyProviderType causing 401 errors

[Copilot]

Users encounter 401 Unauthorized errors when accessing workflow instances after configuring .UseAdminApiKey(). The authentication middleware is configured correctly but dependency injection resolves the wrong provider type.

Root Cause

DefaultAuthenticationFeature.UseApiKeyAuthorization<T>() updates the authentication builder but fails to update the ApiKeyProviderType property, creating a mismatch:

// Before: Auth middleware uses AdminApiKeyProvider, but DI still registers DefaultApiKeyProvider
public DefaultAuthenticationFeature UseApiKeyAuthorization<T>() where T : class, IApiKeyProvider
{
    _configureApiKeyAuthorization = builder => builder.AddApiKeyInAuthorizationHeader<T>();
    // Missing: ApiKeyProviderType = typeof(T);
    return this;
}

Changes

• DefaultAuthenticationFeature.cs: Add ApiKeyProviderType = typeof(T) to synchronize auth middleware and DI registrations
• Elsa.Server.Web/Program.cs: Enable UseAdminApiKey() in Development environment for easier local testing

Usage

.UseDefaultAuthentication(auth =>
{
    if (builder.Environment.IsDevelopment())
        auth.UseAdminApiKey(); // Now correctly accepts API key: 00000000-0000-0000-0000-000000000000
})

Original prompt

---

This section details on the original issue you should resolve

<issue_title>How to authorize workflow instances for employee onboarding process?</issue_title>
<issue_description>Teacher,Hi
The following is an example of an error in the employee onboarding process:

</issue_description>

<agent_instructions>Try and see if you can identify the likely root cause of the reported symptom. The UI portion of the bug report comes from Elsa Studio, which exists at: https://github.com/elsa-workflows/elsa-studio, in case you want to check that out as well.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes How to authorize workflow instances for employee onboarding process? #7092

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This change is