fix(tests): add main platform fixture to store dashboard tests

The store dashboard endpoint uses require_platform which needs the
PlatformContextMiddleware to resolve a platform. TestClient uses
'testserver' as Host, which the middleware maps to the 'main' platform.
Added _ensure_main_platform fixture to create it in the test DB.

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

tests/integration/api/v1/store/test_dashboard.py

@@ -11,10 +11,36 @@ Tests cover:
 
 import pytest
 
+from app.modules.tenancy.models import Platform
+
+
+@pytest.fixture
+def _ensure_main_platform(db):
+    """Ensure a 'main' platform exists for the PlatformContextMiddleware.
+
+    The TestClient uses 'testserver' as Host, which the middleware treats as
+    localhost and resolves to the 'main' platform via path_prefix lookup.
+    """
+    platform = db.query(Platform).filter(Platform.code == "main").first()
+    if not platform:
+        platform = Platform(
+            code="main",
+            name="Main Platform",
+            path_prefix="main",
+            is_active=True,
+            is_public=True,
+            default_language="en",
+            supported_languages=["en"],
+        )
+        db.add(platform)
+        db.commit()
+    return platform
+
 
 @pytest.mark.integration
 @pytest.mark.api
 @pytest.mark.store
+@pytest.mark.usefixtures("_ensure_main_platform")
 class TestStoreDashboardAPI:
     """Test store dashboard stats endpoint"""