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/schemas/source.py

@@ -0,0 +1,51 @@
+"""Source schemas."""
+from __future__ import annotations
+
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict, Field, HttpUrl
+
+from app.models.source import SourceKind
+
+
+class SourceOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    name: str
+    slug: str
+    kind: SourceKind
+    url: str
+    enabled: bool
+    region: str | None = None
+    language_src: str | None = None
+    priority: int
+    fetch_interval_min: int
+    translate_to: str
+    last_fetched_at: datetime | None = None
+    last_status: str | None = None
+    consecutive_failures: int = 0
+
+
+class SourceIn(BaseModel):
+    name: str = Field(min_length=1, max_length=128)
+    slug: str = Field(min_length=1, max_length=128, pattern=r"^[a-z0-9-]+$")
+    kind: SourceKind = SourceKind.RSS
+    url: HttpUrl
+    region: str | None = None
+    language_src: str | None = None
+    priority: int = Field(default=50, ge=1, le=100)
+    fetch_interval_min: int = Field(default=60, ge=5, le=1440)
+    translate_to: str = "zh"
+    enabled: bool = True
+    detail_selector: dict | None = None
+    headers_json: dict | None = None
+
+
+class SourceUpdate(BaseModel):
+    name: str | None = None
+    enabled: bool | None = None
+    priority: int | None = Field(default=None, ge=1, le=100)
+    fetch_interval_min: int | None = Field(default=None, ge=5, le=1440)
+    region: str | None = None
+    translate_to: str | None = None