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/src/composables/useEventSource.ts

@@ -0,0 +1,10 @@
+/** 订阅 SSE 事件；组件卸载时关闭。断线由浏览器自动重连 */
+export function useEventSource<T>(url: string, event: string, onMessage: (data: T) => void) {
+  const connected = ref(false)
+  const source = new EventSource(url)
+  source.addEventListener("open", () => connected.value = true)
+  source.addEventListener("error", () => connected.value = false)
+  source.addEventListener(event, e => onMessage(JSON.parse((e as MessageEvent).data)))
+  onBeforeUnmount(() => source.close())
+  return { connected }
+}

web/src/composables/useSourceNames.ts

@@ -0,0 +1,13 @@
+import { listSources } from "@/apis/crawler"
+
+const names = ref<Record<string, string>>({})
+
+/** 来源 code → 中文名，全局只请求一次 */
+export function useSourceNames() {
+  if (Object.keys(names.value).length === 0) {
+    listSources().then((info) => {
+      names.value = Object.fromEntries(info.sources.map(s => [s.code, s.name]))
+    })
+  }
+  return names
+}