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/subscription.py

@@ -0,0 +1,48 @@
+"""关键词订阅(命中即通知)。"""
+from __future__ import annotations
+
+import enum
+from datetime import datetime
+
+from sqlalchemy import (
+    Boolean,
+    DateTime,
+    Enum,
+    ForeignKey,
+    String,
+    Text,
+    func,
+)
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.database import Base
+
+
+class SubscriptionMatch(str, enum.Enum):
+    ANY = "any"  # 标题或正文
+    TITLE = "title"
+    BODY = "body"
+
+
+class Subscription(Base):
+    __tablename__ = "subscriptions"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    user_id: Mapped[int] = mapped_column(
+        ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
+    )
+    keyword: Mapped[str] = mapped_column(String(255), nullable=False)
+    # 简单关键词,匹配走 ILIKE '%kw%';后续可加 regex/lucene
+    match_in: Mapped[SubscriptionMatch] = mapped_column(
+        Enum(SubscriptionMatch, name="subscription_match"),
+        default=SubscriptionMatch.ANY,
+        nullable=False,
+    )
+    channel: Mapped[str] = mapped_column(String(32), default="telegram", nullable=False)
+    # telegram / email / web
+    target: Mapped[str | None] = mapped_column(Text)  # chat_id / email
+    enabled: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
+    last_hit_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), nullable=False
+    )