feat: 添加 PrimeVue 组件演示页面

src/pages/Login.page.vue

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+<script setup lang="ts"></script>
+
+<template>
+  <div>Login</div>
+</template>

src/pages/demos/primevue-demo.page.vue

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+<script setup lang="ts">
+import type { ToastMessageOptions } from 'primevue/toast';
+
+definePage({
+  meta: {},
+});
+</script>
+
+<template>
+  <div class="prime-vue-demo-page">
+    <Card>
+      <template #title>PrimeVue 组件演示</template>
+      <template #content>
+        <Message severity="info">演示 PrimeVue 各种组件的使用方法和功能特性</Message>
+
+        <Panel header="Toast 消息" class="mt-1.5">
+          <div flex="~ wrap" gap="4">
+            <Button
+              v-for="severity in [
+                'secondary',
+                'success',
+                'info',
+                'warn',
+                'error',
+                'contrast',
+                undefined,
+              ] satisfies ToastMessageOptions['severity'][]"
+              :key="severity ?? 'default'"
+              @click="
+                ToastService.add({
+                  severity: severity,
+                  summary: `severity: ${severity ?? 'default'}`,
+                  life: 5000,
+                  detail: '消息内容',
+                })
+              "
+            >
+              {{ `${severity ?? 'default'}` }}
+            </Button>
+          </div>
+        </Panel>
+      </template>
+    </Card>
+  </div>
+</template>