Scope integration fixtures per backend subdirectory.

Split Redis and MinIO container setup into backend-specific conftest modules so only the containers needed for collected tests are imported and started.

Co-authored-by: Cursor <cursoragent@cursor.com>

pyproject.toml

@@ -43,6 +43,8 @@ pythonpath = ["."]
 addopts = "--import-mode=importlib"
 markers = [
     "integration: tests requiring Docker containers (deselect with '-m \"not integration\"')",
+    "needs_redis: integration test requiring a Redis container",
+    "needs_minio: integration test requiring a MinIO container",
 ]
 
 [tool.coverage.run]