Add frequencies api route

src/routes/api/v1/frequencies/+server.ts

@@ -0,0 +1,7 @@
+import type { RequestHandler } from './$types';
+import { prisma } from '$lib/db';
+
+export const GET: RequestHandler = async () => {
+    const frequencies = await prisma.solfeggioFrequency.findMany()
+    return new Response(JSON.stringify(frequencies))
+}