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

.env.example

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+# ===== 通用 =====
+TZ=Asia/Hong_Kong
+LOG_LEVEL=INFO
+
+# ===== 数据库 =====
+POSTGRES_USER=news
+POSTGRES_PASSWORD=change_me_strong_password
+POSTGRES_DB=news
+POSTGRES_HOST=postgres
+POSTGRES_PORT=5432
+
+# ===== Redis =====
+REDIS_HOST=redis
+REDIS_PORT=6379
+REDIS_PASSWORD=change_me_redis_password
+REDIS_DB=0
+
+# ===== JWT =====
+# openssl rand -hex 64 生成
+JWT_SECRET=change_me_to_a_64byte_random_hex
+JWT_ALGORITHM=HS256
+ACCESS_TOKEN_TTL_MIN=60
+REFRESH_TOKEN_TTL_DAY=14
+
+# ===== 腾讯云 TMT 翻译 =====
+# https://console.cloud.tencent.com/cam/capi 申请
+TENCENTCLOUD_SECRET_ID=your_tencent_secret_id
+TENCENTCLOUD_SECRET_KEY=your_tencent_secret_key
+TENCENTCLOUD_REGION=ap-hongkong
+TENCENT_TMT_ENDPOINT=tmt.tencentcloudapi.com
+# 字符配额(月度,5000000 = 500 万)
+TENCENT_TMT_QUOTA_MONTH=5000000
+# 缓冲比例(0.05 = 95% 触发后切本地)
+TENCENT_TMT_QUOTA_BUFFER=0.05
+# 单次请求最大字符
+TENCENT_TMT_MAX_CHARS_PER_REQ=4500
+
+# ===== 本地翻译(降级) =====
+# 不启用就留空:不会用本地模型
+LOCAL_TRANSLATE_ENABLED=false
+LOCAL_TRANSLATE_MODEL=nllb-200-distilled-600M
+LOCAL_TRANSLATE_DEVICE=cpu
+
+# ===== 抓取 =====
+# 全局 QPS 上限
+FETCH_GLOBAL_QPS=4
+# 单源超时(秒)
+FETCH_TIMEOUT=20
+# 单源失败连续次数后暂停
+FETCH_FAIL_PAUSE_THRESHOLD=3
+# 单源 fetch 最大重试次数
+FETCH_MAX_RETRIES=2
+
+# ===== Caddy / 域名 =====
+# 留空走 IP 自签证书;有域名走自动 HTTPS
+DOMAIN=
+# 邮箱(Let's Encrypt 用)
+ACME_EMAIL=you@example.com