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/tracking-configs/+page.svelte

@@ -3,6 +3,7 @@
 	import { slide } from 'svelte/transition';
 	import { api } from '$lib/api';
 	import { t } from '$lib/i18n';
+	import { trackingConfigsCache } 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';
@@ -15,7 +16,7 @@
 	import { snackSuccess, snackError } from '$lib/stores/snackbar.svelte';
 	import type { TrackingConfig } from '$lib/types';
 
-	let configs = $state<TrackingConfig[]>([]);
+	let configs = $derived(trackingConfigsCache.items);
 	let loaded = $state(false);
 	let showForm = $state(false);
 	let editing = $state<number | null>(null);
@@ -40,7 +41,7 @@
 
 	onMount(load);
 	async function load() {
-		try { configs = await api('/tracking-configs'); }
+		try { await trackingConfigsCache.fetch(true); }
 		catch (err: any) { error = err.message || t('common.loadError'); snackError(error); }
 		finally { loaded = true; }
 	}