feat: 添加新的受众选择和报名功能，新增多个API请求，更新样式以优化用户体验

src/api/signup/commonStudent.js

@@ -0,0 +1,37 @@
+import ajax2 from "../unionAjax.js";
+
+export const STUDENT_LIST = "/manageApi/admin/student/getStudent";
+export const USER_LIST_PAGE = "/manageApi/admin/thirdApi/user/list";
+export const ORG_LIST = "/manageApi/admin/thirdApi/org/list";
+export const ORG_CHILD_LIST = "/manageApi/admin/thirdApi/org/info";
+// 查询受众中的用户列表
+export const AUDIENCE_LIST = "/userbasic/audience/memberList";
+
+export const USER_AUDIENCES = "/manageApi/admin/thirdApi/audience/userAudiences";
+export const fetchUserAudiences = (params) =>
+  ajax2.get1(USER_AUDIENCES, params);
+// 保存学员信息（走 manageApi，POST）
+export const saveStu = (data) =>
+  ajax2.postJson("/manageApi", "/admin/student/addStudent", data);
+
+// 获取项目学员列表（走 manageApi，GET）弃用
+export const fetchProjectStudents = (params = {}) => {
+  return ajax2.get1(STUDENT_LIST, params);
+};
+
+// 快速学员搜索（走 manageApi，POST）
+export const fetchQuickStudents = (params) =>
+  ajax2.get1(USER_LIST_PAGE, params);
+
+// 组织列表（走 manageApi，POST）
+export const fetchOrgList = (params) =>
+  ajax2.get1(ORG_LIST, params);
+
+// 子组织列表（走 manageApi，POST）
+export const fetchOrgChildren = (params) =>
+  ajax2.get1(ORG_CHILD_LIST, params);
+
+// 受众中的用户列表（POST，application/json）
+export const fetchAudienceList = (data) =>
+  ajax2.postJson("", AUDIENCE_LIST, data);
+