Add /health endpoint with DB connectivity check

main.py

@@ -107,6 +107,17 @@ class ListWithItems(ListResponse):
 def read_root():
     return {"message": "Shopping List API"}
 
+@app.get("/health", tags=["meta"])
+def health_check():
+    conn = get_db()
+    try:
+        conn.execute("SELECT 1").fetchone()
+        conn.close()
+        return {"status": "ok"}
+    except Exception as e:
+        conn.close()
+        return {"status": "error", "detail": str(e)}, 503
+
 @app.post("/products", response_model=ProductResponse, status_code=201, tags=["products"])
 def create_product(product: Product):
     conn = get_db()