Initial commit: Add project files

frontend/src/App.vue

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+<script setup lang="ts">
+import { RouterLink, RouterView } from 'vue-router'
+import { AppShellLayout } from './shared/ui/layouts'
+</script>
+<template>
+  <AppShellLayout>
+    <template #navigation><nav class="app-nav"><RouterLink to="/research/sell-decision">매도 의사결정</RouterLink><RouterLink to="/ops/data-quality">데이터 품질</RouterLink><RouterLink to="/ops/model-operations">모델 운영</RouterLink><RouterLink to="/internal/ui-standard">표준 UI 패턴</RouterLink></nav></template>
+    <RouterView />
+  </AppShellLayout>
+</template>
+<style scoped>.app-nav{display:grid;gap:var(--ks-space-2)}.app-nav a{padding:var(--ks-space-2) var(--ks-space-3);border-radius:var(--ks-radius-sm);text-decoration:none}.app-nav a.router-link-active{background:var(--ks-color-neutral-100);font-weight:700}</style>