fix: correct targeted search logic for material/stock list to prevent unrelated results

inventory-backend/init_db.py

@@ -0,0 +1,9 @@
+from app import create_app, db
+
+# 1. 创建应用实例
+app = create_app()
+
+# 2. 在应用上下文中创建表
+with app.app_context():
+    db.create_all()
+    print("✅ 数据库表结构已成功创建！")