chore(gateway): 인증 조합별 상류 상태코드 로그 + deploy.sh 가 TOKEN_PREFIX=bearer 채움

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

5_django_backend/apps/gateway/views.py

@@ -100,6 +100,7 @@ async def chat_completions(request: HttpRequest) -> HttpResponse:
                 for i, (vkey, vh) in enumerate(variants):
                     req = client.build_request("POST", cfg.url, headers=vh, json=body)
                     resp = await client.send(req, stream=True)
+                    log.info("ito ← %s (auth %s/%s: %s)", resp.status_code, i + 1, len(variants), vkey)
                     if resp.status_code == 401 and i + 1 < len(variants):
                         await resp.aclose()  # 인증 형식이 안 맞은 것 — 다른 조합으로 한 번 더
                         continue