feat(vue-app,flask): Vue 试验田全量对接与 Session 用户上下文统一

新增 vue-app（生成/收藏/历史/登录/优化/Android/饭菜/诗词/简历等），Flask 增加 user_context 并调整历史、生成、简历等路由；模板 base/generate 可访问性改进；补充部署说明与文档。

Made-with: Cursor

vue-app/src/layouts/AuthLayout.vue

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+<template>
+  <div class="auth-shell">
+    <router-view />
+  </div>
+</template>
+
+<style scoped lang="scss">
+.auth-shell {
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 1.5rem 1rem;
+  background: linear-gradient(160deg, #f1f5f9 0%, #e0e7ff 45%, #f8fafc 100%);
+}
+</style>

vue-app/src/layouts/DefaultLayout.vue

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+<script setup lang="ts">
+import AppHeader from '@/components/layout/AppHeader.vue'
+</script>
+
+<template>
+  <div class="app-shell">
+    <AppHeader />
+    <main class="app-main">
+      <router-view />
+    </main>
+  </div>
+</template>
+
+<style scoped lang="scss">
+.app-shell {
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  background: var(--app-bg, #f8fafc);
+}
+
+.app-main {
+  flex: 1;
+  max-width: 1200px;
+  width: 100%;
+  margin: 0 auto;
+  padding: 1.25rem 1rem 2.5rem;
+}
+</style>