feat: telegram commands, app settings, bot polling, webhook handling, UI improvements

Adds telegram bot command system with 13 commands (search, latest, random, etc.),
webhook/polling handlers, rate limiting, app settings page, and various UI/UX
improvements across all entity pages.

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

frontend/src/routes/setup/+page.svelte

@@ -2,7 +2,7 @@
 	import { goto } from '$app/navigation';
 	import { onMount } from 'svelte';
 	import { setup } from '$lib/auth.svelte';
-	import { t, initLocale } from '$lib/i18n';
+	import { t } from '$lib/i18n';
 	import { initTheme } from '$lib/theme.svelte';
 	import MdiIcon from '$lib/components/MdiIcon.svelte';
 
@@ -13,7 +13,7 @@
 	let submitting = $state(false);
 	let mounted = $state(false);
 
-	onMount(() => { initLocale(); initTheme(); mounted = true; });
+	onMount(() => { initTheme(); mounted = true; });
 
 	async function handleSubmit(e: SubmitEvent) {
 		e.preventDefault();