Add testing guide: HTTP request file, integration tests, and README

[Copilot]

No documentation or tooling existed to exercise the API after standing it up. Three testing surfaces are now provided.

MilestoneBaseServer.http

Step-by-step REST Client file covering the full workflow — login → register server → sync cameras → manage users → grant permissions → create views → verify viewer isolation. Works natively in Visual Studio 2022 and VS Code with REST Client.

Integration tests (ApiIntegrationTests)

11 end-to-end tests using WebApplicationFactory<Program>. Each test gets an isolated in-memory database via a custom TestApiFactory. Covers the complete HTTP contract:

• Auth: valid login returns JWT, wrong password → 401, no token → 401
• RBAC: viewer token on admin endpoint → 403
• Full CRUD for servers, users, permissions, views
• Permission grants make cameras visible to the viewer
• Shared views are visible across users

internal sealed class TestApiFactory : WebApplicationFactory<Program>
{
    private readonly string _dbName = "IntegrationTest-" + Guid.NewGuid();

    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureServices(services =>
        {
            // swap in a fresh isolated in-memory database per test
            services.RemoveAll<DbContextOptions<BaseServerDbContext>>();
            services.AddDbContext<BaseServerDbContext>(opt =>
                opt.UseInMemoryDatabase(_dbName));
        });
    }
}

README

Added quick-start, three testing paths (dotnet test, .http file, curl/PowerShell), full API reference table, and architecture diagram.

Bug fix

launchSettings.json had the http and https profiles merged into a single invalid JSON object; split them back into separate profiles.

Original prompt

I want to build a Base Server to connect different milestone management servers into. It will not matter what version/feature set they have. Then the xprotect client will connect/authenticate into the base server where it will view the associated cameras. The permissions for the base server and view setup's will be done in the base server.

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