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>

shared/types/pocketbase.ts

@@ -0,0 +1,95 @@
+export interface Organization {
+  id: string
+  name: string
+  slug: string
+  timezone: string
+  industry: string
+  owner: string
+  plan: 'free' | 'pro' | 'business'
+  plan_employee_limit: number
+  plan_history_months: number
+  stripe_customer_id: string
+  stripe_subscription_id: string
+  stripe_subscription_status: string
+  trial_ends_at: string
+  created: string
+  updated: string
+}
+
+export interface PBEmployee {
+  id: string
+  org_id: string
+  name: string
+  email: string
+  employee_number: string
+  roles: string[]
+  skills: string[]
+  employment_type: string
+  weekly_hours_target: number
+  max_weekly_hours: number
+  available_periods: string[]
+  unavailable_dates: string[]
+  notes: string
+  active: boolean
+  created: string
+  updated: string
+}
+
+export interface PBConstraint {
+  id: string
+  org_id: string
+  label: string
+  source_text: string
+  constraint_json: import('./constraint').ConstraintJSON
+  scope: string
+  scope_ref: string
+  category: string
+  hard: boolean
+  weight: number
+  active: boolean
+  source: string
+  template_id: string
+  created: string
+  updated: string
+}
+
+export interface PBScheduleRun {
+  id: string
+  org_id: string
+  name: string
+  period_start: string
+  period_end: string
+  framework_snapshot: unknown
+  constraints_snapshot: unknown
+  employees_snapshot: unknown
+  status: 'pending' | 'solving' | 'solved' | 'infeasible' | 'error'
+  solver_duration_ms: number
+  objective_value: number
+  infeasibility_hints: unknown
+  result: unknown
+  created_by: string
+  created: string
+  updated: string
+}
+
+export interface LegalTemplate {
+  id: string
+  region: string
+  law_name: string
+  label: string
+  description: string
+  constraint_json: import('./constraint').ConstraintJSON
+  category: string
+  mandatory: boolean
+  sort_order: number
+}
+
+export interface ShiftFramework {
+  id: string
+  org_id: string
+  periods: import('./schedule').Period[]
+  shifts: import('./schedule').Shift[]
+  scheduling_horizon_days: number
+  created: string
+  updated: string
+}