feat(Design): 优化题目顺序和索引

- 调整题目移动逻辑，更新题目索引
- 修复新建题目时的索引问题
- 优化选择题目组件，实时更新题目索引
- 调整调查创建页面，初始化时设置题目索引

components.d.ts

@@ -31,12 +31,14 @@ declare module 'vue' {
     VanCol: typeof import('vant/es')['Col']
     VanDivider: typeof import('vant/es')['Divider']
     VanField: typeof import('vant/es')['Field']
+    VanForm: typeof import('vant/es')['Form']
     VanGrid: typeof import('vant/es')['Grid']
     VanGridItem: typeof import('vant/es')['GridItem']
     VanIcon: typeof import('vant/es')['Icon']
     VanList: typeof import('vant/es')['List']
     VanNavBar: typeof import('vant/es')['NavBar']
     VanPicker: typeof import('vant/es')['Picker']
+    VanPopover: typeof import('vant/es')['Popover']
     VanPopup: typeof import('vant/es')['Popup']
     VanRadio: typeof import('vant/es')['Radio']
     VanRadioGroup: typeof import('vant/es')['RadioGroup']