feat(文档): 添加RImg组件并配置资源路径别名

删除未使用的Custom.vue组件，新增RImg组件用于处理资源图片路径
在vite配置中添加资源路径别名，简化图片引用方式
更新client.ts注册RImg组件

docs/.vuepress/config.ts

@@ -3,6 +3,11 @@ import { plumeTheme } from 'vuepress-theme-plume'
 import { viteBundler } from '@vuepress/bundler-vite'
 import { commentPlugin } from '@vuepress/plugin-comment'
 import { umamiAnalyticsPlugin } from '@vuepress/plugin-umami-analytics'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
 
 export default defineUserConfig({
   base: '/',
@@ -14,7 +19,16 @@ export default defineUserConfig({
     ['link', { rel: 'icon', type: 'image/png', href: 'https://theme-plume.vuejs.press/favicon-32x32.png' }],
   ],
 
-  bundler: viteBundler(),
+  bundler: viteBundler({
+    viteOptions: {
+      resolve: {
+        alias: {
+          '@resources': path.resolve(__dirname, '../resources'),
+          '/@resources': path.resolve(__dirname, '../resources'),
+        },
+      },
+    },
+  }),
   shouldPrefetch: false,
 
   theme: plumeTheme({