tests: smoke tests for Account and Blog BCs

Two tests, two bounded contexts (BCs as enumerated in
doc/ddd-exploration-2026-06-14.md):

  - AccountSmokeTests : GET /signin
    YavscConstants.SigninPath = "~/signin"
    Routing + Razor + IdentityServer + EF + DI all wired.

  - BlogSmokeTests : GET /BlogSpot/Index
    BlogSpotController (note the capital S) under
    Controllers/Communicating/. No class-level [Route], so
    conventional /{controller}/{action} applies.

Both use TestWebApplicationFactory<Program> + the EF InMemory
provider wired by WebServerFixture.SetupHost, so they boot the
production HTTP pipeline without sockets, certs or a real DB.

Closes the 'Tests d'integration smoke par BC' item of Jalon 0
in ROADMAP.md (Yavsc.Api / Yavsc.Blogs coverage to come).

src/Yavsc.Org.Tests/Smoke/AccountSmokeTests.cs

@@ -0,0 +1,36 @@
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Yavsc.Org.Tests.Smoke;
+
+/// <summary>
+/// Smoke for the Account BC (login / registration / OIDC discovery).
+/// Hits the in-memory test server through
+/// <see cref="TestWebApplicationFactory"/>: no sockets, no
+/// self-signed certificates, no real DB (the
+/// <c>AddInMemoryCollection</c> in <c>WebServerFixture.SetupHost</c>
+/// points the EF context at the in-memory provider).
+///
+/// <c>GET /signin</c> is the public login endpoint served by
+/// <c>Yavsc.Org/Controllers/Accounting/AccountController</c>
+/// (decorated <c>[HttpGet(YavscConstants.SigninPath)]</c> with
+/// <c>YavscConstants.SigninPath = "~/signin"</c>). A 200 means the
+/// entire pipeline (routing + Razor + IdentityServer + EF + DI)
+/// is wired correctly end-to-end.
+/// </summary>
+public class AccountSmokeTests : SmokeTestBase, IClassFixture<TestWebApplicationFactory>
+{
+    private readonly TestWebApplicationFactory _factory;
+
+    public AccountSmokeTests(TestWebApplicationFactory factory)
+    {
+        _factory = factory;
+    }
+
+    [Fact]
+    public async Task GetSignin_returns_a_page()
+    {
+        using var client = _factory.CreateClient();
+        await AssertResponds(client, "/signin");
+    }
+}

src/Yavsc.Org.Tests/Smoke/BlogSmokeTests.cs

@@ -0,0 +1,35 @@
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Yavsc.Org.Tests.Smoke;
+
+/// <summary>
+/// Smoke for the Blog BC. Hits <c>Yavsc.Org</c> on
+/// <c>GET /BlogSpot/Index</c> — the front-end page that lists blog
+/// posts. The controller is <c>BlogSpotController</c> (note the
+/// capital S) under <c>Yavsc.Org/Controllers/Communicating/</c>,
+/// without a class-level <c>[Route]</c>, so the conventional
+/// <c>/{controller}/{action}</c> route applies (controller name
+/// preserved case).
+///
+/// The blog backend API itself lives in <c>Yavsc.Blogs</c> on a
+/// separate host in production; cf.
+/// <c>doc/architecture/decoupage-organisation.md</c>. The smoke
+/// here asserts the front-end side of the BC.
+/// </summary>
+public class BlogSmokeTests : SmokeTestBase, IClassFixture<TestWebApplicationFactory>
+{
+    private readonly TestWebApplicationFactory _factory;
+
+    public BlogSmokeTests(TestWebApplicationFactory factory)
+    {
+        _factory = factory;
+    }
+
+    [Fact]
+    public async Task GetBlogSpotIndex_returns_a_page()
+    {
+        using var client = _factory.CreateClient();
+        await AssertResponds(client, "/BlogSpot/Index");
+    }
+}