feat: complete ShiftCraft — AI-powered shift scheduling SaaS

Complete implementation including:
- Landing page with hero, features, how-it-works, pricing
- Employee management (CRUD with soft delete)
- AI constraint parser (Anthropic Claude API)
- German labor law templates (ArbZG §3, §5, §9)
- HiGHS ILP solver for optimal fair schedules
- Schedule calendar result view (employee × date grid)
- Shift framework configuration (periods + shifts)
- Subscription tiers: Free / Pro / Business
- PocketBase setup script with collection creation + seed data
- .env.example with all required variables documented

Pages: employees, constraints (list/new/templates), schedules (list/new/[id]),
       settings (organization/shifts/billing), dashboard

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/layouts/auth.vue

@@ -0,0 +1,15 @@
+<template>
+  <div class="min-h-screen bg-gradient-to-br from-indigo-50 via-white to-violet-50 flex items-center justify-center px-4">
+    <div class="w-full max-w-md">
+      <!-- Logo -->
+      <div class="text-center mb-8">
+        <div class="w-12 h-12 rounded-2xl bg-gradient-to-br from-indigo-500 to-violet-600 flex items-center justify-center mx-auto mb-4">
+          <span class="text-white font-bold text-xl">S</span>
+        </div>
+        <h1 class="text-2xl font-bold text-gray-900">ShiftCraft</h1>
+        <p class="text-gray-500 text-sm mt-1">Schichtplanung, die Ihre Sprache spricht</p>
+      </div>
+      <slot />
+    </div>
+  </div>
+</template>