✨ feat(clock): add complete Clock app with backend, web, and landing

Features:
- World clock with timezone support and drag & drop sorting
- Alarms with repeat days, snooze, and custom sounds
- Multiple timers with start/pause/reset controls
- Stopwatch with lap times (local only)
- Pomodoro timer with customizable intervals
- Analog and digital clock widgets
- i18n support (DE, EN, FR, ES, IT)

Stack:
- Backend: NestJS 10, Drizzle ORM, PostgreSQL (port 3017)
- Web: SvelteKit 2.x, Svelte 5 runes, Tailwind CSS 4 (port 5186)
- Landing: Astro 5.x with animated clock hero (port 4323)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/clock/packages/shared/src/constants/index.ts

@@ -0,0 +1,77 @@
+// Popular timezones with city names
+export const POPULAR_TIMEZONES = [
+	{ timezone: 'America/New_York', city: 'New York', region: 'Americas' },
+	{ timezone: 'America/Los_Angeles', city: 'Los Angeles', region: 'Americas' },
+	{ timezone: 'America/Chicago', city: 'Chicago', region: 'Americas' },
+	{ timezone: 'America/Toronto', city: 'Toronto', region: 'Americas' },
+	{ timezone: 'America/Sao_Paulo', city: 'São Paulo', region: 'Americas' },
+	{ timezone: 'Europe/London', city: 'London', region: 'Europe' },
+	{ timezone: 'Europe/Paris', city: 'Paris', region: 'Europe' },
+	{ timezone: 'Europe/Berlin', city: 'Berlin', region: 'Europe' },
+	{ timezone: 'Europe/Rome', city: 'Rome', region: 'Europe' },
+	{ timezone: 'Europe/Madrid', city: 'Madrid', region: 'Europe' },
+	{ timezone: 'Europe/Amsterdam', city: 'Amsterdam', region: 'Europe' },
+	{ timezone: 'Europe/Vienna', city: 'Vienna', region: 'Europe' },
+	{ timezone: 'Europe/Zurich', city: 'Zurich', region: 'Europe' },
+	{ timezone: 'Europe/Moscow', city: 'Moscow', region: 'Europe' },
+	{ timezone: 'Asia/Tokyo', city: 'Tokyo', region: 'Asia' },
+	{ timezone: 'Asia/Shanghai', city: 'Shanghai', region: 'Asia' },
+	{ timezone: 'Asia/Hong_Kong', city: 'Hong Kong', region: 'Asia' },
+	{ timezone: 'Asia/Singapore', city: 'Singapore', region: 'Asia' },
+	{ timezone: 'Asia/Seoul', city: 'Seoul', region: 'Asia' },
+	{ timezone: 'Asia/Mumbai', city: 'Mumbai', region: 'Asia' },
+	{ timezone: 'Asia/Dubai', city: 'Dubai', region: 'Asia' },
+	{ timezone: 'Australia/Sydney', city: 'Sydney', region: 'Oceania' },
+	{ timezone: 'Australia/Melbourne', city: 'Melbourne', region: 'Oceania' },
+	{ timezone: 'Pacific/Auckland', city: 'Auckland', region: 'Oceania' },
+] as const;
+
+// Available alarm sounds
+export const ALARM_SOUNDS = [
+	{ id: 'default', name: 'Default', nameDE: 'Standard' },
+	{ id: 'gentle', name: 'Gentle', nameDE: 'Sanft' },
+	{ id: 'classic', name: 'Classic', nameDE: 'Klassisch' },
+	{ id: 'digital', name: 'Digital', nameDE: 'Digital' },
+	{ id: 'nature', name: 'Nature', nameDE: 'Natur' },
+	{ id: 'chime', name: 'Chime', nameDE: 'Glockenspiel' },
+] as const;
+
+// Timer presets
+export const QUICK_TIMER_PRESETS = [
+	{ label: '1 min', seconds: 60 },
+	{ label: '3 min', seconds: 180 },
+	{ label: '5 min', seconds: 300 },
+	{ label: '10 min', seconds: 600 },
+	{ label: '15 min', seconds: 900 },
+	{ label: '30 min', seconds: 1800 },
+	{ label: '45 min', seconds: 2700 },
+	{ label: '1 hour', seconds: 3600 },
+] as const;
+
+// Pomodoro presets
+export const POMODORO_PRESETS = [
+	{
+		name: 'Classic Pomodoro',
+		nameDE: 'Klassischer Pomodoro',
+		workDuration: 25 * 60,
+		breakDuration: 5 * 60,
+		longBreakDuration: 15 * 60,
+		sessionsBeforeLongBreak: 4,
+	},
+	{
+		name: 'Short Focus',
+		nameDE: 'Kurzer Fokus',
+		workDuration: 15 * 60,
+		breakDuration: 3 * 60,
+		longBreakDuration: 10 * 60,
+		sessionsBeforeLongBreak: 4,
+	},
+	{
+		name: 'Deep Work',
+		nameDE: 'Tiefes Arbeiten',
+		workDuration: 50 * 60,
+		breakDuration: 10 * 60,
+		longBreakDuration: 30 * 60,
+		sessionsBeforeLongBreak: 3,
+	},
+] as const;