feat: init rssKeeper - RSS 抓取、管理与检索系统

完整功能包括:
- FastAPI 后端 + SQLite + FTS5 全文搜索
- RSS 源管理、自动发现、OPML 导入导出
- 文章抓取、去重、分类、全文检索
- RSS 源健康度监控
- Vue 3 + Element Plus 暗色主题 Web UI
- 对外 REST API 供 AI 分析调用
- Docker + docker-compose 部署

docker-compose.yml

@@ -0,0 +1,28 @@
+version: '3.8'
+
+services:
+  rsskeeper:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: rsskeeper
+    ports:
+      - "8000:8000"
+    volumes:
+      - ./data:/app/data
+    environment:
+      - DATA_DIR=/app/data
+      - DATABASE_URL=/app/data/rsskeeper.db
+      - FETCH_CONCURRENCY=10
+      - FETCH_TIMEOUT=30
+      - DEFAULT_FETCH_INTERVAL=60
+      - MIN_FETCH_INTERVAL=15
+      - MAX_ARTICLE_CONTENT_LENGTH=50000
+      - MAX_SUMMARY_LENGTH=500
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/api/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s