feat: add database configuration and health check

backend/hermes/app/db/health.py

@@ -0,0 +1,12 @@
+from sqlalchemy import text
+
+from app.db.database import engine
+
+
+def check_database() -> bool:
+    try:
+        with engine.connect() as connection:
+            connection.execute(text("SELECT 1"))
+        return True
+    except Exception:
+        return False