Add .http file to ApiService in starter template

[DamianEdwards]

Description

Adds a .http file to the ApiService project in the starter template.

Fixes #9592

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
• Are you including unit tests for the changes and scenario tests if relevant?
  • No
• Did you add public API?
  • No
• Does the change make any security assumptions or guarantees?
  • No
• Does the change require an update in our Aspire docs?
  • No

[Copilot]

Pull Request Overview

Adds a new HTTP request template for the ApiService project in the starter template, enabling quick manual testing of the default weather forecast endpoint.

• Introduces a .http file with a configurable host address and a GET request for /weatherforecast.
• Provides a template variable for the service host that can be adjusted locally.

Comments suppressed due to low confidence (1)

src/Aspire.ProjectTemplates/templates/aspire-starter/9.4/Aspire-StarterApplication.1.ApiService/Aspire-StarterApplication.1.ApiService.http:1

• [nitpick] Consider adding a brief comment at the top of this .http file explaining its purpose and how to run it (e.g., using the VS Code REST Client extension) so that users unfamiliar with .http files can quickly get started.

@Aspire_StarterApplication.1.ApiService_HostAddress = http://localhost:5301

[joperezr]

Must be missing something, but shouldn't this be the https one? So port 7301?

[DamianEdwards]

No, this matches what the API template does, and it's because if the app is launched with the "http" launch profile, there won't be an HTTPS port, only HTTP. The HTTP port is consistent between both the "http" and "https" launch profiles so we use it here.

[joperezr]

Minor comment but looks good otherwise.