feat: update project structure and docs

tests/integration/conftest.py

@@ -0,0 +1,18 @@
+# Integration test fixtures
+# Provides: test database, external service connections
+
+import pytest
+
+
+@pytest.fixture
+def test_db_connection():
+    """Create test database connection."""
+    # TODO: Implement when DB is added to project
+    yield "test_db"
+
+
+@pytest.fixture
+def cleanup_db():
+    """Cleanup database after test."""
+    yield
+    # TODO: Implement cleanup logic