Add OpenAPI spec for new API, and wire up a new API handler

Based on Aura and JSONAPI

server/api/api_suite_test.go

@@ -0,0 +1,17 @@
+package api
+
+import (
+	"testing"
+
+	"github.com/navidrome/navidrome/log"
+	"github.com/navidrome/navidrome/tests"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+func TestApi(t *testing.T) {
+	tests.Init(t, false)
+	log.SetLevel(log.LevelFatal)
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Navidrome JSON:API Suite")
+}