refactor(admin,ui,test): 完善数据库迁移脚本，添加单元测试并调整前端配置

优化所有alembic迁移脚本的离线模式支持，添加已存在对象检查逻辑，避免重复执行出错。
为各个迁移脚本添加对应的单元测试，覆盖核心场景保障逻辑正确性。
修改前端配置文件，将默认API地址切换为线上服务器8.138.234.141:4000。
新增本地数据备份文件wonderq-local-data.dump和项目发布包wonderq-admin-release-20260823-01.tar。

WonderQ-Admin/tests/test_vehicle_demand_migration.py

@@ -0,0 +1,38 @@
+from importlib.util import module_from_spec, spec_from_file_location
+from pathlib import Path
+
+
+MIGRATION_PATH = Path(__file__).parents[1] / "alembic" / "versions" / "0024_vehicle_demand.py"
+SPEC = spec_from_file_location("vehicle_demand_migration", MIGRATION_PATH)
+assert SPEC and SPEC.loader
+MIGRATION = module_from_spec(SPEC)
+SPEC.loader.exec_module(MIGRATION)
+
+
+def test_vehicle_demand_columns_are_added_only_when_missing():
+    assert MIGRATION.missing_lead_columns(set()) == {
+        "leadType",
+        "contactName",
+        "customerId",
+        "vehicleDemand",
+    }
+    assert MIGRATION.missing_lead_columns({"leadType", "contactName"}) == {
+        "customerId",
+        "vehicleDemand",
+    }
+
+
+def test_vehicle_demand_indexes_and_foreign_key_are_only_added_when_missing():
+    assert MIGRATION.missing_named_indexes(set(), MIGRATION.LEAD_INDEXES) == {
+        "ix_Lead_leadType",
+        "ix_Lead_customerId",
+    }
+    assert not MIGRATION.should_create_customer_fk(
+        [
+            {
+                "referred_table": "Customer",
+                "referred_columns": ["id"],
+                "constrained_columns": ["customerId"],
+            }
+        ]
+    )