Initial AlphaPulse implementation: news crawler and Binance klines

- Backend (FastAPI, SQLAlchemy 2, Alembic): single-admin cookie auth,
  news/crawler/market APIs with SSE and WebSocket streaming
- Crawler (Scrapy + Scrapy-Redis): wscn_news, wscn_live, cls_depth,
  cls_telegraph spiders, idempotent upserts with revisions, raw response
  archiving, per-source subprocess supervision, restart and backoff
- Market worker: full-history Binance spot/USD-M kline backfill,
  realtime WS stream, hourly and on-reconnect catch-up
- Frontend (Vue 3, Element Plus, UnoCSS, KLineChart): news feed,
  crawler console with live logs, Binance-style chart page
- Deploy: docker compose, nginx site, migrate and daily backup scripts

deploy/migrate.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+# 迁移前先备份：只有一套环境，迁移即生产操作
+set -eu
+cd "$(dirname "$0")"
+mkdir -p ../backups
+dump="../backups/alphapulse-premigrate-$(date +%Y%m%d-%H%M%S).dump"
+docker exec postgres pg_dump -U alphapulse -Fc alphapulse > "$dump"
+echo "已备份：$dump"
+docker compose build api
+docker compose run --rm -T api alembic upgrade head