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/login/+page.svelte

@@ -3,7 +3,7 @@
 	import { onMount } from 'svelte';
 	import { api } from '$lib/api';
 	import { login } from '$lib/auth.svelte';
-	import { t, initLocale, getLocale, setLocale } from '$lib/i18n';
+	import { t, getLocale, setLocale } from '$lib/i18n';
 	import { initTheme, getTheme, setTheme, type Theme } from '$lib/theme.svelte';
 	import MdiIcon from '$lib/components/MdiIcon.svelte';
 
@@ -15,7 +15,6 @@
 	let mounted = $state(false);
 
 	onMount(async () => {
-		initLocale();
 		initTheme();
 		mounted = true;
 		try {