Add recurring bills poster, scheduler boot, and manual run stub

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/hooks.server.ts

@@ -1,5 +1,8 @@
 import { redirect, type Handle } from '@sveltejs/kit';
 import { validateSession, setSessionCookie } from '$lib/server/auth/index.js';
+import { startScheduler } from '$lib/server/recurring-bills/scheduler.js';
+
+startScheduler();
 
 export const handle: Handle = async ({ event, resolve }) => {
 	// Redirect implicit /favicon.ico requests to our SVG to avoid 404 noise