feat: entity cache system, nav UX improvements, split CLAUDE.md

- Add $state-based entity cache layer with 30s TTL, request deduplication,
  and local mutation helpers (entity-cache.svelte.ts + caches.svelte.ts)
- Wire all 10 page components to use shared caches for cross-page data
- Add slide animation for nav tree expand/collapse with rotating chevron
- Remove aggregate count badges from container nav nodes (keep on leaves)
- Convert Targets from flat leaf to group with per-type children
  (Telegram, Webhook, Email, Discord, Slack, ntfy, Matrix)
- Add URL-based type filtering on Targets page with per-type descriptions
- Add Bots group children for Email and Matrix alongside Telegram
- Tab-based routing for bots page (?tab=telegram/email/matrix)
- Add per-type target counts and email/matrix bot counts to /status/counts
- Split CLAUDE.md into focused context files under .claude/docs/
- Fix .gitignore: scope lib/ to root, allow .claude/docs/ tracking
- Clear all caches on logout
- Reset form state when switching target type tabs

frontend/src/routes/+page.svelte

@@ -2,6 +2,7 @@
 	import { onMount } from 'svelte';
 	import { api } from '$lib/api';
 	import { t } from '$lib/i18n';
+	import { providersCache } from '$lib/stores/caches.svelte';
 	import PageHeader from '$lib/components/PageHeader.svelte';
 	import Card from '$lib/components/Card.svelte';
 	import Loading from '$lib/components/Loading.svelte';
@@ -9,7 +10,7 @@
 	import EventChart from '$lib/components/EventChart.svelte';
 
 	let status = $state<any>(null);
-	let providers = $state<any[]>([]);
+	let providers = $derived(providersCache.items);
 	let chartDays = $state<any[]>([]);
 	let loaded = $state(false);
 	let error = $state('');
@@ -130,13 +131,12 @@
 
 	async function loadInitial() {
 		try {
-			const [statusRes, providersRes, chartRes] = await Promise.all([
+			const [statusRes, , chartRes] = await Promise.all([
 				api<any>(`/status?limit=${eventsLimit}`),
-				api<any[]>('/providers'),
+				providersCache.fetch(),
 				api<any>('/status/chart'),
 			]);
 			status = statusRes;
-			providers = providersRes;
 			chartDays = chartRes.days || [];
 			setTimeout(() => {
 				animateCount(0, status.providers, (v) => displayProviders = v);