feat: initial MVP - FastAPI backend + Vue3 frontend + docker-compose

- backend: FastAPI + SQLAlchemy 2.0(async) + asyncpg + Alembic
- 7 API routes: auth/me/articles/sources/bookmarks/subscriptions/admin
- models: User/Source/Article/Bookmark/Subscription/ApiToken
- services: RSS fetcher (feedparser) + Tencent TMT translator with quota + cache + local NLLB fallback
- workers: APScheduler + asyncio pipeline (fetch -> dedupe -> insert -> translate)
- seed scripts: create_user, seed_sources (5 RSS: Reuters/BBC/Al Jazeera/NHK/DW)
- frontend: Vue 3 + Vite + Naive UI + Pinia + vue-router
- pages: Login, Feed (24h), ArticleDetail, Sources, Bookmarks, AdminSources
- deploy: docker-compose (postgres/redis/api/worker/frontend/caddy)
- docs: README, DEPLOY, architecture, acceptance

frontend/src/App.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+import { onMounted } from 'vue'
+import { NConfigProvider, NMessageProvider, NDialogProvider, darkTheme } from 'naive-ui'
+import { RouterView } from 'vue-router'
+import { useAuthStore } from '@/stores/auth'
+
+const auth = useAuthStore()
+onMounted(() => auth.restore())
+</script>
+
+<template>
+  <NConfigProvider :theme="null">
+    <NMessageProvider>
+      <NDialogProvider>
+        <RouterView />
+      </NDialogProvider>
+    </NMessageProvider>
+  </NConfigProvider>
+</template>