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.

backend/app/market/binance.py

@@ -0,0 +1,52 @@
+from __future__ import annotations
+
+import httpx
+
+from app.market.base import MarketData
+from app.schemas import Candle
+
+BASE_URL = "https://api.binance.com"
+
+
+def to_exchange_symbol(symbol: str) -> str:
+    return symbol.replace("/", "").upper()
+
+
+class BinanceMarketData(MarketData):
+    """Public Binance spot market data over REST (no API key required)."""
+
+    def __init__(self, base_url: str = BASE_URL, timeout: float = 10.0) -> None:
+        self._client = httpx.AsyncClient(base_url=base_url, timeout=timeout)
+
+    async def fetch_candles(self, symbol: str, timeframe: str, limit: int) -> list[Candle]:
+        response = await self._client.get(
+            "/api/v3/klines",
+            params={
+                "symbol": to_exchange_symbol(symbol),
+                "interval": timeframe,
+                "limit": limit,
+            },
+        )
+        response.raise_for_status()
+        return [
+            Candle(
+                ts=int(row[0]),
+                open=float(row[1]),
+                high=float(row[2]),
+                low=float(row[3]),
+                close=float(row[4]),
+                volume=float(row[5]),
+            )
+            for row in response.json()
+        ]
+
+    async def fetch_price(self, symbol: str) -> float:
+        response = await self._client.get(
+            "/api/v3/ticker/price",
+            params={"symbol": to_exchange_symbol(symbol)},
+        )
+        response.raise_for_status()
+        return float(response.json()["price"])
+
+    async def close(self) -> None:
+        await self._client.aclose()