feat(proxy-route): allow -1 to disable rate limits

internal/apps/openflare/proxy_route/helpers_limit_test.go

@@ -0,0 +1,29 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package proxy_route
+
+import "testing"
+
+func TestNormalizeProxyRouteLimitConnValue(t *testing.T) {
+	t.Parallel()
+	got, err := normalizeProxyRouteLimitConnValue(-1, "limit_conn_per_server")
+	if err != nil || got != -1 {
+		t.Fatalf("want -1, got %d err %v", got, err)
+	}
+	if _, err := normalizeProxyRouteLimitConnValue(-2, "limit_conn_per_server"); err == nil {
+		t.Fatal("expected error for -2")
+	}
+}
+
+func TestNormalizeProxyRouteLimitRate(t *testing.T) {
+	t.Parallel()
+	got, err := normalizeProxyRouteLimitRate("-1")
+	if err != nil || got != "-1" {
+		t.Fatalf("want -1, got %q err %v", got, err)
+	}
+	got, err = normalizeProxyRouteLimitRate("0")
+	if err != nil || got != "" {
+		t.Fatalf("want empty inherit, got %q err %v", got, err)
+	}
+}