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/api/subscriptions.py

@@ -0,0 +1,68 @@
+"""/subscriptions 关键词订阅。"""
+from __future__ import annotations
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.deps import get_current_user
+from app.database import get_session
+from app.models.subscription import Subscription
+from app.models.user import User
+from app.schemas.misc import SubscriptionIn, SubscriptionOut
+
+router = APIRouter(prefix="/subscriptions", tags=["subscriptions"])
+
+
+@router.post("", response_model=SubscriptionOut, status_code=status.HTTP_201_CREATED)
+async def create(
+    body: SubscriptionIn,
+    user: User = Depends(get_current_user),
+    session: AsyncSession = Depends(get_session),
+):
+    sub = Subscription(
+        user_id=user.id,
+        keyword=body.keyword,
+        match_in=body.match_in,
+        channel=body.channel,
+        target=body.target,
+    )
+    session.add(sub)
+    await session.commit()
+    await session.refresh(sub)
+    return SubscriptionOut.model_validate(sub)
+
+
+@router.get("", response_model=list[SubscriptionOut])
+async def list_mine(
+    user: User = Depends(get_current_user),
+    session: AsyncSession = Depends(get_session),
+):
+    rows = (
+        await session.execute(
+            select(Subscription)
+            .where(Subscription.user_id == user.id)
+            .order_by(Subscription.created_at.desc())
+        )
+    ).scalars()
+    return [SubscriptionOut.model_validate(s) for s in rows]
+
+
+@router.delete("/{sub_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete(
+    sub_id: int,
+    user: User = Depends(get_current_user),
+    session: AsyncSession = Depends(get_session),
+):
+    sub = (
+        await session.execute(
+            select(Subscription).where(
+                Subscription.id == sub_id, Subscription.user_id == user.id
+            )
+        )
+    ).scalar_one_or_none()
+    if not sub:
+        raise HTTPException(status.HTTP_404_NOT_FOUND, "Subscription not found")
+    await session.delete(sub)
+    await session.commit()
+    return None