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

backend/src/alphapulse/models/__init__.py

@@ -0,0 +1,17 @@
+from alphapulse.core.db import Base
+from alphapulse.models.market import Kline, KlineSyncState, MarketSymbol
+from alphapulse.models.news import CrawlLog, CrawlRun, NewsItem, NewsRevision, RawBody, RawResponse, Source
+
+__all__ = [
+    "Base",
+    "CrawlLog",
+    "CrawlRun",
+    "Kline",
+    "KlineSyncState",
+    "MarketSymbol",
+    "NewsItem",
+    "NewsRevision",
+    "RawBody",
+    "RawResponse",
+    "Source",
+]