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/main.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+from collections.abc import AsyncIterator
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.routes import router
+from app.config import Settings, get_settings
+from app.db import init_db
+from app.runtime import Runtime
+
+
+def create_app(
+    settings: Settings | None = None,
+    runtime: Runtime | None = None,
+) -> FastAPI:
+    settings = settings or get_settings()
+    runtime = runtime or Runtime(settings)
+
+    @asynccontextmanager
+    async def lifespan(app: FastAPI) -> AsyncIterator[None]:
+        init_db()
+        app.state.runtime = runtime
+        yield
+        await runtime.shutdown()
+
+    app = FastAPI(title=settings.app_name, lifespan=lifespan)
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=settings.cors_origin_list,
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+    app.include_router(router)
+
+    @app.get("/")
+    def root() -> dict[str, str]:
+        return {"name": settings.app_name, "docs": "/docs"}
+
+    return app
+
+
+app = create_app()