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>

server/utils/anthropic.ts

@@ -0,0 +1,14 @@
+import Anthropic from '@anthropic-ai/sdk'
+
+let _client: Anthropic | null = null
+
+export function getAnthropicClient(): Anthropic {
+  const config = useRuntimeConfig()
+  if (!config.anthropicApiKey) {
+    throw new Error('ANTHROPIC_API_KEY is not configured')
+  }
+  if (!_client) {
+    _client = new Anthropic({ apiKey: config.anthropicApiKey as string })
+  }
+  return _client
+}