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/+page.svelte

@@ -105,7 +105,11 @@
 		eventsLimit = calcPageSize();
 		window.addEventListener('resize', onResize);
 		loadInitial();
-		return () => window.removeEventListener('resize', onResize);
+		return () => {
+			window.removeEventListener('resize', onResize);
+			clearTimeout(searchTimeout);
+			clearTimeout(resizeTimeout);
+		};
 	});
 
 	async function loadInitial() {