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/logbody_test.go

@@ -0,0 +1,25 @@
+package gateway
+
+import (
+	"testing"
+
+	"github.com/rose_cat707/luminary/internal/provider"
+)
+
+func TestExtractAPIErrorMessage_OpenAI(t *testing.T) {
+	body := []byte(`{"error":{"message":"Invalid API key","type":"invalid_request_error"}}`)
+	got := extractAPIErrorMessage(body)
+	if got != "invalid_request_error: Invalid API key" {
+		t.Fatalf("got %q", got)
+	}
+}
+
+func TestDescribeForwardError_WithBody(t *testing.T) {
+	got := describeForwardError(nil, &provider.ChatResponse{
+		StatusCode: 400,
+		Body:       []byte(`{"error":{"message":"model not found"}}`),
+	})
+	if got != "status 400: model not found" {
+		t.Fatalf("got %q", got)
+	}
+}