fix: 修复部署后切换页面 JS chunk 404 白屏问题

- main.ts 监听 vite:preloadError，chunk 加载失败时自动刷新一次
- 新增 ChunkErrorBoundary 组件，捕获 Vue 渲染层 chunk 加载异常
- App.vue 包裹 ChunkErrorBoundary
- docker/nginx.conf 修复缓存策略：index.html 不缓存，/assets/ 长缓存 immutable

src/components/core/others/ChunkErrorBoundary.vue

@@ -0,0 +1,29 @@
+<template>
+  <slot />
+</template>
+
+<script setup lang="ts">
+  import { onErrorCaptured } from 'vue'
+
+  onErrorCaptured((err, instance, info) => {
+    const message = err?.message || ''
+    const isChunkError =
+      message.includes('dynamically imported module') ||
+      message.includes('Failed to fetch') ||
+      message.includes('Loading chunk') ||
+      message.includes('ChunkLoadError') ||
+      message.includes('Unable to preload CSS')
+
+    if (isChunkError) {
+      const key = '__chunk_reload__'
+      if (!sessionStorage.getItem(key)) {
+        sessionStorage.setItem(key, '1')
+        window.location.reload()
+        return false
+      }
+    }
+
+    console.error('[ChunkErrorBoundary]', err, info)
+    return true
+  })
+</script>