feat: 更新配置和组件以支持构建时间显示功能, 修复读弹幕的问题

- 在vite.config.mts中添加__BUILD_TIME__常量以记录构建时间
- 在AboutView.vue中显示构建时间及其相对时间
- 在ReadDanmaku.vue中重构语音合成状态管理，优化礼物合并逻辑
- 更新相关类型定义，增强代码可读性和可维护性

src/auto-imports.d.ts

@@ -553,6 +553,6 @@ declare global {
 // for type re-export
 declare global {
   // @ts-ignore
-  export type { Component, ComponentPublicInstance, ComputedRef, DirectiveBinding, ExtractDefaultPropTypes, ExtractPropTypes, ExtractPublicPropTypes, InjectionKey, PropType, Ref, MaybeRef, MaybeRefOrGetter, VNode, WritableComputedRef } from 'vue'
+  export type { Component, Slot, Slots, ComponentPublicInstance, ComputedRef, DirectiveBinding, ExtractDefaultPropTypes, ExtractPropTypes, ExtractPublicPropTypes, InjectionKey, PropType, Ref, MaybeRef, MaybeRefOrGetter, VNode, WritableComputedRef } from 'vue'
   import('vue')
 }