Crypto trading bot: engine, brokers, backtester, dashboard, deploy

FastAPI backend with a single-strategy async engine, paper and Binance
brokers, pure-python indicators, a backtester that shares the engine's
portfolio math, and a Vue dashboard with a live WebSocket feed. Adds the
Gitea Actions CI/CD workflow that deploys to Traefik via docker_default.

docker-compose.local.yml

@@ -0,0 +1,37 @@
+# Local / self-contained stack: no Traefik, publishes ports directly.
+# Usage: docker compose -f docker-compose.local.yml up --build
+# Dashboard: http://localhost:8080   API docs: http://localhost:8000/docs
+name: crypto_trading_local
+
+services:
+  backend:
+    build: ./backend
+    container_name: crypto-trading-backend-local
+    restart: unless-stopped
+    environment:
+      - MODE=${MODE:-paper}
+      - EXCHANGE=${EXCHANGE:-binance}
+      - SYMBOL=${SYMBOL:-BTC/USDT}
+      - TIMEFRAME=${TIMEFRAME:-1m}
+      - POLL_INTERVAL=${POLL_INTERVAL:-5}
+      - STARTING_BALANCE=${STARTING_BALANCE:-10000}
+      - FEE_BPS=${FEE_BPS:-10}
+      - SLIPPAGE_BPS=${SLIPPAGE_BPS:-5}
+      - DATABASE_URL=sqlite:////data/trader.db
+      - CORS_ORIGINS=*
+      - EXCHANGE_API_KEY=${EXCHANGE_API_KEY:-}
+      - EXCHANGE_API_SECRET=${EXCHANGE_API_SECRET:-}
+      - EXCHANGE_SANDBOX=${EXCHANGE_SANDBOX:-false}
+    volumes:
+      - ./data:/data
+    ports:
+      - "8000:8000"
+
+  frontend:
+    build: ./frontend
+    container_name: crypto-trading-frontend-local
+    restart: unless-stopped
+    depends_on:
+      - backend
+    ports:
+      - "8080:80"