debug: add /api/sftp-test

backend/api.py

@@ -224,3 +224,15 @@ def jobs_status(job_id: str, req: StatusReq, x_worker_token: Optional[str] = Hea
     job.status = req.status
     job.message = req.message
     return {"ok": True, "job_id": job_id, "status": job.status}
+
+
+@app.get("/api/sftp-test")
+def api_sftp_test():
+    # returns quickly if SFTP reachable, otherwise errors/timeout
+    try:
+        # reuse download_bytes to avoid duplication (reads tiny path)
+        # list isn't implemented here, so just try to fetch a known-nonexistent file and ensure it errors fast
+        download_bytes("does_not_exist.txt")
+        return {"ok": True, "note": "unexpectedly read file"}
+    except Exception as e:
+        return {"ok": False, "error": str(e)[:200]}