Added /api/types route

pages/database/types.go

@@ -0,0 +1,21 @@
+package database
+
+import (
+	"sort"
+
+	"github.com/aerogo/aero"
+	"github.com/animenotifier/notify.moe/arn"
+)
+
+// Types shows which types are available in the database.
+func Types(ctx aero.Context) error {
+	typeMap := arn.DB.Types()
+	types := make([]string, 0, len(typeMap))
+
+	for typeName := range typeMap {
+		types = append(types, typeName)
+	}
+
+	sort.Strings(types)
+	return ctx.JSON(types)
+}