Initial commit: Luminary AI Gateway

OpenAI-compatible AI gateway with Vue admin UI, multi-provider egress,
ingress key governance, monitoring, and security controls.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/gateway/upstream_test.go

@@ -0,0 +1,27 @@
+package gateway
+
+import (
+	"net/http"
+	"testing"
+)
+
+func TestRetryableUpstreamStatus(t *testing.T) {
+	if !retryableUpstreamStatus(http.StatusTooManyRequests) {
+		t.Fatal("429 should be retryable")
+	}
+	if !retryableUpstreamStatus(http.StatusServiceUnavailable) {
+		t.Fatal("503 should be retryable")
+	}
+	if retryableUpstreamStatus(http.StatusBadRequest) {
+		t.Fatal("400 should not be retryable")
+	}
+}
+
+func TestTryNextKeyOnUpstreamStatus(t *testing.T) {
+	if !tryNextKeyOnUpstreamStatus(http.StatusTooManyRequests) {
+		t.Fatal("429 should try next key")
+	}
+	if !tryNextKeyOnUpstreamStatus(http.StatusUnauthorized) {
+		t.Fatal("401 should try next key")
+	}
+}