refactor: 统一项目代码风格并修复多处类型与调用问题

本次提交包含多项优化：
1.  移除大量冗余的文件头注释与过时的from __future__导入
2.  将CRUD的list方法统一重命名为get_list保持接口一致
3.  修复前后端状态字段类型不匹配问题，将string类型status改为number
4.  修正前端文案错别字，将"代办事项"修正为标准写法
5.  更新sqlalchemy版本并调整依赖配置
6.  新增缓存工具类替代fastapi-cache2，重构缓存调用逻辑
7.  新增开源授权函生成相关工具与数据库字段支持
8.  为多个业务模块添加防重复提交loading状态
9.  修复邮件模型的外键关联缺失问题
10. 优化pdf生成工具的导入时机与文档注释

frontend/web/src/views/module_example/demo/index.vue

@@ -38,7 +38,8 @@
             :perm-delete="['module_example:demo:delete']"
             :perm-patch="['module_example:demo:patch']"
             :delete-loading="batchDeleting"
-            @add="openEditDialog('add')"
+            :create-loading="createLoading"
+            @add="handleAdd"
             @import="openImport"
             @export="openExport"
             @delete="handleBatchDelete"
@@ -250,6 +251,8 @@ const faTableRef = ref<{ elTableRef?: { clearSelection: () => void } } | null>(n
 const { selectedRows, selectedIds, batchDeleting, onTableSelectionChange } =
   useTableSelection<DemoTable>();
 
+const createLoading = ref(false);
+
 const {
   columns,
   columnChecks,
@@ -580,6 +583,15 @@ async function openDetailDialog(row: DemoTable) {
   dialogVisible.visible = true;
 }
 
+async function handleAdd() {
+  createLoading.value = true;
+  try {
+    await openEditDialog("add");
+  } finally {
+    createLoading.value = false;
+  }
+}
+
 async function openEditDialog(type: "add" | "edit", row?: DemoTable) {
   dialogVisible.type = type === "add" ? "create" : "update";
   if (type === "add") {
@@ -679,7 +691,7 @@ async function handleBatchDelete() {
   }
 }
 
-async function runBatchStatus(status: string) {
+async function runBatchStatus(status: number) {
   const ids = selectedIds.value;
   if (ids.length === 0) {
     ElMessage.warning("请先在列表中勾选数据");
@@ -687,7 +699,7 @@ async function runBatchStatus(status: string) {
   }
   try {
     await confirmAction(
-      `确认对选中的 ${ids.length} 条数据${status === "0" ? "启用" : "停用"}？`,
+      `确认对选中的 ${ids.length} 条数据${status === 0 ? "启用" : "停用"}？`,
       "批量设置"
     );
     await DemoAPI.batchDemo({ ids, status });