style: 更新主题样式和图标资源

调整主题渐变背景颜色并移除未使用的样式
更新前端和文档站点的logo及favicon图标
移除未使用的ElMessageBox类型声明

fastdocs/.vitepress/theme/style.css

@@ -15,14 +15,19 @@
 
   /* 图标背景 */
   --vp-home-hero-image-background-image: linear-gradient(
+    -45deg,
+    #bd34fe80 50%,
+    #47caff80 50%
+  );
+  /* --vp-home-hero-image-background-image: linear-gradient(
     -45deg,
     #bd34fe 50%,
     #47caff 50%
-  );
+  ); */
   --vp-home-hero-image-filter: blur(44px);
 
   /* brand按钮 */
-  --vp-button-brand-border: #F6CEEC;
+  /* --vp-button-brand-border: #F6CEEC; */
   --vp-button-brand-text: #F6CEEC;
   --vp-button-brand-bg: #D939CD;
 

frontend/src/types/auto-imports.d.ts

@@ -325,7 +325,6 @@ declare module 'vue' {
   interface ComponentCustomProperties {
     readonly EffectScope: UnwrapRef<typeof import('vue')['EffectScope']>
     readonly ElMessage: UnwrapRef<typeof import('element-plus/es')['ElMessage']>
-    readonly ElMessageBox: UnwrapRef<typeof import('element-plus/es')['ElMessageBox']>
     readonly ElNotification: UnwrapRef<typeof import('element-plus/es')['ElNotification']>
     readonly acceptHMRUpdate: UnwrapRef<typeof import('pinia')['acceptHMRUpdate']>
     readonly asyncComputed: UnwrapRef<typeof import('@vueuse/core')['asyncComputed']>