feat(@vben/web-antd): 用户-项目绑定管理双入口

- 用户管理页：下拉操作新增 "分配项目" 按钮 + assign-project-form.vue 弹窗
  沿用现有 assign-role-form 的交互（多选 + 覆盖写入）
- 项目管理页：行操作新增 "管理成员" 按钮 + assign-user-form.vue 弹窗
  下拉支持搜索用户 nickname/username
- 新建 api/system/user-project/ 封装 4 个接口
- api/system/project 新增 getAllProjectSimpleList：
  顶栏 simple-list 已改为用户授权过滤，管理员分配场景需要全量下拉
- 空集保存二次确认：清空所有分配/成员时弹 AntModal.confirm，防误操作
- 权限点：system:user:assign-project / system:project:assign-user

设计文档：docs/design/2026-04-23-user-project-binding.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web-antd/src/views/system/project/modules/assign-user-form.vue

@@ -0,0 +1,98 @@
+<script lang="ts" setup>
+import type { SystemProjectApi } from '#/api/system/project';
+
+import { useVbenModal } from '@vben/common-ui';
+
+import { message, Modal as AntModal } from 'ant-design-vue';
+
+import { useVbenForm } from '#/adapter/form';
+import {
+  assignProjectUsers,
+  getUserIdsByProjectId,
+} from '#/api/system/user-project';
+import { $t } from '#/locales';
+
+import { useAssignUserFormSchema } from '../data';
+
+const emit = defineEmits(['success']);
+
+const [Form, formApi] = useVbenForm({
+  commonConfig: {
+    componentProps: {
+      class: 'w-full',
+    },
+    formItemClass: 'col-span-2',
+    labelWidth: 80,
+  },
+  layout: 'horizontal',
+  schema: useAssignUserFormSchema(),
+  showDefaultActions: false,
+});
+
+const [Modal, modalApi] = useVbenModal({
+  async onConfirm() {
+    const { valid } = await formApi.validate();
+    if (!valid) {
+      return;
+    }
+    const values = await formApi.getValues();
+    const userIds: number[] = values.userIds ?? [];
+
+    // 空集二次确认：清空该项目所有成员是高危操作
+    if (userIds.length === 0) {
+      const confirmed = await new Promise<boolean>((resolve) => {
+        AntModal.confirm({
+          title: '确认清空项目成员？',
+          content: `即将清空项目【${values.name}】的所有成员，保存后除超管外所有用户都将无法访问该项目。确认继续？`,
+          okText: '确认清空',
+          okType: 'danger',
+          cancelText: '取消',
+          onOk: () => resolve(true),
+          onCancel: () => resolve(false),
+        });
+      });
+      if (!confirmed) {
+        return;
+      }
+    }
+
+    modalApi.lock();
+    try {
+      await assignProjectUsers({
+        projectId: values.id,
+        userIds,
+      });
+      await modalApi.close();
+      emit('success');
+      message.success($t('ui.actionMessage.operationSuccess'));
+    } finally {
+      modalApi.unlock();
+    }
+  },
+  async onOpenChange(isOpen: boolean) {
+    if (!isOpen) {
+      return;
+    }
+    const data = modalApi.getData<SystemProjectApi.Project>();
+    if (!data || !data.id) {
+      return;
+    }
+    modalApi.lock();
+    try {
+      const userIds = await getUserIdsByProjectId(data.id);
+      await formApi.setValues({
+        ...data,
+        userIds,
+      });
+    } finally {
+      modalApi.unlock();
+    }
+  },
+});
+</script>
+
+<template>
+  <Modal title="管理成员">
+    <Form class="mx-4" />
+  </Modal>
+</template>