fix(api): 加 /health 存活探针端点(治Docker HEALTHCHECK恒unhealthy,/health原404)

sanguo_api/main.py

@@ -61,6 +61,12 @@ def build_app(config_path: str = "config/backtest.yaml", static_dir: str | None
         max_workers=max_workers,
     )
 
+    # Liveness probe for Docker HEALTHCHECK (curl -f /health). Registered
+    # unconditionally so it works with or without the SPA static mount.
+    @app.get("/health", include_in_schema=False)
+    async def _health() -> dict[str, str]:
+        return {"status": "ok"}
+
     # SPA static mount with history fallback. Register the root route BEFORE
     # mounting StaticFiles at "/" so the explicit handler wins for "/".
     if static_dir and os.path.isdir(static_dir):