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/alembic/versions/20261013_c7e1beb72c75_symbol_precision.py

@@ -0,0 +1,36 @@
+"""symbol precision
+
+Revision ID: c7e1beb72c75
+Revises: fb4db40f2e86
+Create Date: 2026-10-13 05:00:25.535575
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'c7e1beb72c75'
+down_revision: Union[str, Sequence[str], None] = 'fb4db40f2e86'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    op.add_column('market_symbols', sa.Column('price_precision', sa.Integer(), nullable=True))
+    op.add_column('market_symbols', sa.Column('volume_precision', sa.Integer(), nullable=True))
+    # 默认三个交易对的精度（2026-10-13 币安 exchangeInfo：tickSize 均为 0.01，stepSize 分别为 0.00001/0.0001/0.001）
+    for symbol, volume_precision in (("BTCUSDT", 5), ("ETHUSDT", 4), ("BNBUSDT", 3)):
+        op.execute(sa.text("UPDATE market_symbols SET price_precision = 2, volume_precision = :v WHERE market = 'spot' AND symbol = :s")
+                   .bindparams(v=volume_precision, s=symbol))
+    op.alter_column('market_symbols', 'price_precision', nullable=False)
+    op.alter_column('market_symbols', 'volume_precision', nullable=False)
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    op.drop_column('market_symbols', 'volume_precision')
+    op.drop_column('market_symbols', 'price_precision')