优化组织和用户创建逻辑，简化插入数据结构并处理可选描述字段

src/auth/models/org.ts

@@ -178,7 +178,16 @@ export class Org {
    * 创建组织
    */
   static async create(data: { username: string; description?: string; users: OrgUser[] }): Promise<Org> {
-    const inserted = await db.insert(orgsTable).values(data).returning();
+    const insertData: any = {
+      username: data.username,
+      users: data.users,
+    };
+    
+    if (data.description !== undefined && data.description !== null) {
+      insertData.description = data.description;
+    }
+    
+    const inserted = await db.insert(orgsTable).values(insertData).returning();
     return new Org(inserted[0]);
   }