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/tests/test_strategies.py

@@ -0,0 +1,68 @@
+from __future__ import annotations
+
+from app.engine.strategies import get_strategy, list_strategies, strategy_spec
+from app.engine.strategies.base import StrategyContext
+from app.models import Position, PositionSide
+from app.schemas import Candle
+
+
+def make_candles(closes: list[float]) -> list[Candle]:
+    return [Candle(ts=i, open=c, high=c, low=c, close=c, volume=1.0) for i, c in enumerate(closes)]
+
+
+def test_examples_are_registered() -> None:
+    keys = {cls.key for cls in list_strategies()}
+    assert {"sma_cross", "rsi_reversion"} <= keys
+
+
+def test_param_specs_expose_defaults() -> None:
+    spec = strategy_spec(get_strategy("sma_cross"))
+    names = {param.name for param in spec.params}
+    assert {"fast", "slow", "size"} == names
+    fast = next(param for param in spec.params if param.name == "fast")
+    assert fast.default == 10
+    assert fast.type == "int"
+
+
+def test_unknown_params_rejected() -> None:
+    cls = get_strategy("sma_cross")
+    import pytest
+
+    with pytest.raises(ValueError):
+        cls({"nope": 1})
+
+
+def test_sma_cross_emits_enter_long() -> None:
+    strategy = get_strategy("sma_cross")({"fast": 2, "slow": 4, "size": 0.5})
+    ctx = StrategyContext(
+        candles=make_candles([10, 10, 10, 10, 10, 11]),
+        position=None,
+        equity=1000,
+        cash=1000,
+    )
+    strategy.on_candle(ctx)
+    intents = ctx.take_intents()
+    assert len(intents) == 1
+    assert intents[0].action == "enter_long"
+    assert intents[0].size == 0.5
+
+
+def test_sma_cross_emits_close_on_cross_down() -> None:
+    strategy = get_strategy("sma_cross")({"fast": 2, "slow": 4, "size": 0.5})
+    position = Position(
+        strategy_key="sma_cross",
+        symbol="BTC/USDT",
+        side=PositionSide.LONG,
+        qty=1.0,
+        entry_price=10.0,
+    )
+    ctx = StrategyContext(
+        candles=make_candles([10, 10, 10, 10, 10, 11, 8]),
+        position=position,
+        equity=1000,
+        cash=1000,
+    )
+    strategy.on_candle(ctx)
+    intents = ctx.take_intents()
+    assert len(intents) == 1
+    assert intents[0].action == "close"