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

backend/app/models/__init__.py

@@ -0,0 +1,21 @@
+"""所有 ORM 模型。
+
+新模型请在这里 import,确保 Alembic 自动发现。
+"""
+from app.models.api_token import ApiToken  # noqa: F401
+from app.models.article import Article  # noqa: F401
+from app.models.bookmark import Bookmark  # noqa: F401
+from app.models.source import Source, SourceKind  # noqa: F401
+from app.models.subscription import Subscription  # noqa: F401
+from app.models.user import User, UserRole  # noqa: F401
+
+__all__ = [
+    "ApiToken",
+    "Article",
+    "Bookmark",
+    "Source",
+    "SourceKind",
+    "Subscription",
+    "User",
+    "UserRole",
+]