style: format all Python files with Black

Apply Black formatter to the entire codebase for consistent code style.

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

db/materials_to_delete.py

@@ -72,7 +72,9 @@ def get_materials_to_delete_by_managers(
         """
         with get_connection() as conn:
             results = conn.execute_query(query)
-            material_codes = [row["MaterialCode"] for row in results if row["MaterialCode"]]
+            material_codes = [
+                row["MaterialCode"] for row in results if row["MaterialCode"]
+            ]
             return material_codes
     else:
         # 使用 IN 子句查询多个负责人
@@ -85,7 +87,9 @@ def get_materials_to_delete_by_managers(
         """
         with get_connection() as conn:
             results = conn.execute_query(query, tuple(manager_names))
-            material_codes = [row["MaterialCode"] for row in results if row["MaterialCode"]]
+            material_codes = [
+                row["MaterialCode"] for row in results if row["MaterialCode"]
+            ]
             return material_codes