feat: IconGridSelect, CrossLink, SearchPalette components + entity crosslinks

New components:
- IconGridSelect: Visual grid selector replacing <select> dropdowns,
  with icon + label cells, fixed-position popup, smart placement
- CrossLink: Inline clickable badge for cross-entity navigation,
  hover highlights primary, used on entity cards
- SearchPalette: Ctrl+K global command palette, searches all entity
  types via cached data, grouped results, keyboard navigation

Integration:
- Targets: type selector uses IconGridSelect (4-column grid with icons)
- Targets: bot crosslink on telegram/email/matrix target cards
- Command Trackers: provider and config badges → CrossLinks
- Command Trackers: listener bot name → CrossLink
- Command Configs: template config shown as CrossLink on card
- Notification Trackers: provider CrossLink added to card
- Layout: SearchPalette mounted globally

Infrastructure:
- Added CommandConfig, CommandTemplateConfig, CommandTracker types
- Added notificationTrackersCache, commandTrackersCache to caches
- Added allCaches map and fetchAllCaches() for search palette
- Added searchPalette i18n keys (EN/RU)

frontend/src/lib/components/CrossLink.svelte

@@ -0,0 +1,50 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import MdiIcon from './MdiIcon.svelte';
+
+	let {
+		href,
+		icon = 'mdiLink',
+		label,
+		title = '',
+	}: {
+		href: string;
+		icon?: string;
+		label: string;
+		title?: string;
+	} = $props();
+
+	function navigate(e: MouseEvent) {
+		e.preventDefault();
+		e.stopPropagation();
+		goto(href);
+	}
+</script>
+
+<a {href} class="crosslink" title={title || label} onclick={navigate}>
+	<MdiIcon name={icon} size={12} />
+	<span>{label}</span>
+</a>
+
+<style>
+	.crosslink {
+		display: inline-flex;
+		align-items: center;
+		gap: 0.25rem;
+		font-size: 0.65rem;
+		font-weight: 500;
+		padding: 0.1rem 0.4rem;
+		border-radius: 9999px;
+		background: var(--color-muted);
+		color: var(--color-muted-foreground);
+		text-decoration: none;
+		cursor: pointer;
+		transition: all 0.15s;
+		white-space: nowrap;
+		font-family: var(--font-mono);
+	}
+	.crosslink:hover {
+		background: var(--color-primary);
+		color: var(--color-primary-foreground);
+	}
+</style>