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

web/nginx.conf

@@ -0,0 +1,32 @@
+server {
+  listen 80;
+  root /usr/share/nginx/html;
+
+  location /api/ {
+    proxy_pass http://api:8000;
+    proxy_http_version 1.1;
+    # SSE 不能被缓冲；WebSocket 需要升级头
+    proxy_buffering off;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection $connection_upgrade;
+    proxy_set_header Host $host;
+    proxy_set_header X-Forwarded-Proto $http_x_forwarded_proto;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_read_timeout 1h;
+  }
+
+  location /assets/ {
+    expires 1y;
+    add_header Cache-Control "public, immutable";
+  }
+
+  location / {
+    try_files $uri $uri/ /index.html;
+    add_header Cache-Control "no-cache";
+  }
+}
+
+map $http_upgrade $connection_upgrade {
+  default upgrade;
+  "" "";
+}