feat: 统一状态字段类型为字符串并重构基础类型

refactor: 重构前后端状态字段类型从布尔值改为字符串
feat: 新增基础类型定义和通用类型接口
refactor: 移除不必要的时间范围字段并统一使用created_time
style: 更新前端组件以匹配新的字段命名
docs: 更新接口文档和类型定义

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

@@ -245,15 +245,15 @@
           min-width="140"
         />
         <el-table-column
-          v-if="tableColumns.find((col) => col.prop === 'created_at')?.show"
+          v-if="tableColumns.find((col) => col.prop === 'created_time')?.show"
           label="创建时间"
-          prop="created_at"
+          prop="created_time"
           min-width="180"
         />
         <el-table-column
-          v-if="tableColumns.find((col) => col.prop === 'updated_at')?.show"
+          v-if="tableColumns.find((col) => col.prop === 'updated_time')?.show"
           label="更新时间"
-          prop="updated_at"
+          prop="updated_time"
           min-width="180"
         />
         <el-table-column
@@ -263,7 +263,7 @@
           min-width="120"
         >
           <template #default="scope">
-            <el-tag>{{ scope.row.creator?.name }}</el-tag>
+            <el-tag>{{ scope.row.created_by?.name }}</el-tag>
           </template>
         </el-table-column>
         <el-table-column
@@ -340,13 +340,13 @@
             {{ detailFormData.description }}
           </el-descriptions-item>
           <el-descriptions-item label="创建人" :span="2">
-            {{ detailFormData.creator?.name }}
+            {{ detailFormData.created_by?.name }}
           </el-descriptions-item>
           <el-descriptions-item label="创建时间" :span="2">
-            {{ detailFormData.created_at }}
+            {{ detailFormData.created_time }}
           </el-descriptions-item>
           <el-descriptions-item label="更新时间" :span="2">
-            {{ detailFormData.updated_at }}
+            {{ detailFormData.updated_time }}
           </el-descriptions-item>
         </el-descriptions>
       </template>
@@ -449,8 +449,8 @@ const tableColumns = ref([
   { prop: "name", label: "名称", show: true },
   { prop: "status", label: "状态", show: true },
   { prop: "description", label: "描述", show: true },
-  { prop: "created_at", label: "创建时间", show: true },
-  { prop: "updated_at", label: "更新时间", show: true },
+  { prop: "created_time", label: "创建时间", show: true },
+  { prop: "updated_time", label: "更新时间", show: true },
   { prop: "creator", label: "创建人", show: true },
   { prop: "operation", label: "操作", show: true },
 ]);
@@ -460,8 +460,8 @@ const exportColumns = [
   { prop: "name", label: "名称" },
   { prop: "status", label: "状态" },
   { prop: "description", label: "描述" },
-  { prop: "created_at", label: "创建时间" },
-  { prop: "updated_at", label: "更新时间" },
+  { prop: "created_time", label: "创建时间" },
+  { prop: "updated_time", label: "更新时间" },
 ];
 
 // 导入/导出配置