fix: 限流账号自动退出调度并优化提示文案

backend/internal/service/openai_ws_account_sticky_test.go

@@ -48,6 +48,43 @@ func TestOpenAIGatewayService_SelectAccountByPreviousResponseID_Hit(t *testing.T
 	}
 }
 
+func TestOpenAIGatewayService_SelectAccountByPreviousResponseID_RateLimitedMiss(t *testing.T) {
+	ctx := context.Background()
+	groupID := int64(23)
+	rateLimitedUntil := time.Now().Add(30 * time.Minute)
+	account := Account{
+		ID:               12,
+		Platform:         PlatformOpenAI,
+		Type:             AccountTypeAPIKey,
+		Status:           StatusActive,
+		Schedulable:      true,
+		Concurrency:      1,
+		RateLimitResetAt: &rateLimitedUntil,
+		Extra: map[string]any{
+			"openai_apikey_responses_websockets_v2_enabled": true,
+		},
+	}
+	cache := &stubGatewayCache{}
+	store := NewOpenAIWSStateStore(cache)
+	cfg := newOpenAIWSV2TestConfig()
+	svc := &OpenAIGatewayService{
+		accountRepo:        stubOpenAIAccountRepo{accounts: []Account{account}},
+		cache:              cache,
+		cfg:                cfg,
+		concurrencyService: NewConcurrencyService(stubConcurrencyCache{}),
+		openaiWSStateStore: store,
+	}
+
+	require.NoError(t, store.BindResponseAccount(ctx, groupID, "resp_prev_rl", account.ID, time.Hour))
+
+	selection, err := svc.SelectAccountByPreviousResponseID(ctx, &groupID, "resp_prev_rl", "gpt-5.1", nil)
+	require.NoError(t, err)
+	require.Nil(t, selection, "限额中的账号不应继续命中 previous_response_id 粘连")
+	boundAccountID, getErr := store.GetResponseAccount(ctx, groupID, "resp_prev_rl")
+	require.NoError(t, getErr)
+	require.Zero(t, boundAccountID)
+}
+
 func TestOpenAIGatewayService_SelectAccountByPreviousResponseID_Excluded(t *testing.T) {
 	ctx := context.Background()
 	groupID := int64(23)