V2.0.0-alpha1

frontend/src/views/NotFound.vue

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+<template>
+  <v-container class="fill-height">
+    <v-row align="center" justify="center">
+      <v-col cols="12" sm="8" md="6" class="text-center">
+        <v-card elevation="3" class="pa-6">
+          <v-card-title class="text-h4 mb-4">
+            <v-icon size="x-large" color="error" class="me-2">mdi-alert-circle</v-icon>
+            404 - 页面未找到
+          </v-card-title>
+          
+          <v-card-text class="text-body-1 mb-4">
+            很抱歉，您访问的页面不存在或已被移除。
+          </v-card-text>
+          
+          <v-card-actions class="justify-center">
+            <v-btn
+              color="primary"
+              variant="elevated"
+              size="large"
+              @click="$router.push('/')"
+            >
+              返回首页
+            </v-btn>
+          </v-card-actions>
+        </v-card>
+      </v-col>
+    </v-row>
+  </v-container>
+</template>
+
+<script>
+/**
+ * 404错误页面组件
+ * 当用户访问不存在的路由时显示此页面
+ */
+export default {
+  name: 'NotFound'
+}
+</script>