fix: bypass subscription check in middleware tests

The StorefrontAccessMiddleware was blocking middleware test routes
(/middleware-test/*) with 403 because test stores have no subscriptions.
These tests verify store context detection and theme loading, not
subscription access. Patch SKIP_PATH_PREFIXES in the test conftest to
let test routes through.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/integration/middleware/conftest.py

@@ -65,13 +65,20 @@ def client(db):
     # Patch get_db in middleware modules - they have their own imports
     # The middleware calls: db_gen = get_db(); db = next(db_gen)
     # Also patch settings.platform_domain so subdomain detection works with test hosts
+    # Also bypass StorefrontAccessMiddleware subscription check for test routes —
+    # these tests verify store context detection, not subscription access.
+    from middleware.storefront_access import SKIP_PATH_PREFIXES
+
+    test_skip_prefixes = SKIP_PATH_PREFIXES + ("/middleware-test/",)
+
     with patch("middleware.platform_context.get_db", override_get_db):
         with patch("middleware.store_context.get_db", override_get_db):
             with patch("middleware.theme_context.get_db", override_get_db):
                 with patch("middleware.store_context.settings") as mock_settings:
-                    mock_settings.platform_domain = "platform.com"
-                    client = TestClient(app)
-                    yield client
+                    with patch("middleware.storefront_access.SKIP_PATH_PREFIXES", test_skip_prefixes):
+                        mock_settings.platform_domain = "platform.com"
+                        client = TestClient(app)
+                        yield client
 
     # Clean up
     if get_db in app.dependency_overrides: