style(ui): 统一弹窗及独立表单页按钮文案和样式调整

- 将所有弹窗及独立表单页中的“返回”按钮文案统一改为“取消”
- 独立表单页footer的Avue提交与清空按钮去除内置图标，仅保留文字显示
- 更新相关页面和组件按钮文案，包括业务表单、支付表单、客户档案等
- 规范底部操作栏按钮顺序及样式，确保主次操作区分明显
- 修复部分组件页脚按钮文案，保持全站一致性

src/views/business/project-apply.vue

@@ -620,7 +620,7 @@
       >
           <template v-if="isChangeDialog">
             <el-button v-if="!isProjectFormPage" @click="handleCancelProject">取消</el-button>
-            <el-button v-if="isProjectFormPage" @click="closeProjectForm">返回</el-button>
+            <el-button v-if="isProjectFormPage" @click="closeProjectForm">取消</el-button>
             <el-button type="primary" plain :loading="submitLoading" @click="saveChangeProject">
               保存
             </el-button>
@@ -630,7 +630,7 @@
           </template>
           <template v-else>
             <el-button v-if="!isProjectFormPage" @click="handleCancelProject">取消</el-button>
-            <el-button v-if="isProjectFormPage" @click="closeProjectForm">返回</el-button>
+            <el-button v-if="isProjectFormPage" @click="closeProjectForm">取消</el-button>
             <el-button
               v-if="!dialogReadonly"
               type="primary"