Initial eth_hedge_sim: P0 market, auth UI, one-click deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/main.py

@@ -0,0 +1,109 @@
+from __future__ import annotations
+
+import logging
+from contextlib import asynccontextmanager
+from pathlib import Path
+
+from fastapi import FastAPI, HTTPException
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import FileResponse
+from fastapi.staticfiles import StaticFiles
+
+from .api import router as api_router
+from .config import get_settings
+from .market import MarketGateway, set_gateway
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s %(levelname)s [%(name)s] %(message)s",
+)
+logger = logging.getLogger("eth_hedge_sim")
+
+
+def resolve_frontend_dist() -> Path:
+    here = Path(__file__).resolve()
+    # backend/app/main.py -> repo root is parents[2]
+    repo_root = here.parents[2]
+    return repo_root / "frontend" / "dist"
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    settings = get_settings()
+    if not settings.is_sim:
+        logger.warning("MODE=%s — still read-only market in current phase", settings.mode)
+
+    gw = MarketGateway(settings)
+    set_gateway(gw)
+    try:
+        await gw.start()
+        logger.info("market gateway started (SIM read-only)")
+    except Exception:
+        logger.exception("market gateway failed to start")
+    yield
+    await gw.stop()
+    set_gateway(None)
+
+
+app = FastAPI(
+    title="eth_hedge_sim",
+    version="0.2.0",
+    description="ETH 自动对冲模拟盘",
+    lifespan=lifespan,
+)
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+app.include_router(api_router)
+
+
+@app.get("/health")
+async def health() -> dict:
+    from .market import get_gateway
+
+    settings = get_settings()
+    gw = get_gateway()
+    snap = gw.snapshot()
+    return {
+        "ok": True,
+        "mode": settings.mode,
+        "env_name": settings.env_name,
+        "sim": settings.is_sim,
+        "market_connected": snap.connected,
+        "pair": snap.pair.to_dict() if snap.pair else None,
+        "updated_at_ms": snap.updated_at_ms,
+    }
+
+
+_DIST = resolve_frontend_dist()
+if (_DIST / "assets").is_dir():
+    app.mount("/assets", StaticFiles(directory=str(_DIST / "assets")), name="assets")
+
+
+@app.get("/")
+async def index_page():
+    index = _DIST / "index.html"
+    if index.exists():
+        return FileResponse(index)
+    return {
+        "ok": True,
+        "msg": "frontend not built yet; run: cd frontend && npm ci && npm run build",
+        "health": "/health",
+    }
+
+
+@app.get("/app/{full_path:path}")
+@app.get("/plan")
+@app.get("/trades")
+@app.get("/stats")
+@app.get("/settings")
+@app.get("/login")
+async def spa_pages(full_path: str = ""):
+    index = _DIST / "index.html"
+    if not index.exists():
+        raise HTTPException(status_code=404, detail="frontend not built")
+    return FileResponse(index)