feat: add pytest and pytest-asyncio dependencies for testing

tests/conftest.py

@@ -0,0 +1,10 @@
+"""Pytest configuration & shared fixtures."""
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+# Ensure project root is on sys.path so that `app` package imports succeed during tests.
+PROJECT_ROOT = Path(__file__).resolve().parents[1]
+if str(PROJECT_ROOT) not in sys.path:
+    sys.path.insert(0, str(PROJECT_ROOT))