feat(notify-bridge): phase 7 - frontend restructuring

Notify Bridge frontend with SvelteKit 2 + Svelte 5 + Tailwind CSS v4:
- Auth: login page, setup page, auth state management with $state runes
- Theme: dark/light toggle with localStorage persistence
- i18n: EN/RU translations with reactive $state-based t() function
- Routes: dashboard, providers, trackers, targets, tracking-configs,
  template-configs, telegram-bots, users (stubs for configs pages)
- Providers page: list with card grid, "Add Provider" button
- API client: JWT auth, auto-redirect on 401, typed request helpers
- Branding: "Notify Bridge" throughout, Observatory theme colors

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/routes/targets/+page.svelte

@@ -0,0 +1,34 @@
+<script lang="ts">
+	import { t } from '$lib/i18n/index.svelte.ts';
+	import { api } from '$lib/api.ts';
+	import { onMount } from 'svelte';
+
+	let targets = $state<any[]>([]);
+	let loading = $state(true);
+
+	onMount(async () => {
+		try { targets = await api.get('/targets'); } catch {}
+		loading = false;
+	});
+</script>
+
+<div class="p-6 max-w-5xl mx-auto">
+	<div class="flex items-center justify-between mb-6">
+		<h1 class="text-2xl font-bold">{t('nav.targets')}</h1>
+	</div>
+
+	{#if loading}
+		<p class="text-muted-foreground">{t('common.loading')}</p>
+	{:else if targets.length === 0}
+		<p class="text-muted-foreground text-center py-16">{t('common.noData')}</p>
+	{:else}
+		<div class="grid gap-4 md:grid-cols-2 stagger-children">
+			{#each targets as target}
+				<div class="p-4 bg-card rounded-xl border border-border">
+					<h3 class="font-semibold">{target.name}</h3>
+					<p class="text-xs text-muted-foreground capitalize">{target.type}</p>
+				</div>
+			{/each}
+		</div>
+	{/if}
+</div>