Implement SvelteKit webhook relay with SSE, auth, and real-time features

Co-authored-by: lukeslakemail <lukeslakemail@gmail.com>

sveltekit-integration/src/hooks.server.ts

@@ -0,0 +1,10 @@
+import { handle as authHandle } from '$auth';
+import { sequence } from '@sveltejs/kit/hooks';
+import type { Handle } from '@sveltejs/kit';
+
+const customHandle: Handle = async ({ event, resolve }) => {
+	// Add custom server-side logic here if needed
+	return resolve(event);
+};
+
+export const handle = sequence(authHandle, customHandle);