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/constraint.ts

@@ -0,0 +1,35 @@
+export type ConstraintType =
+  | 'max_hours_per_day'
+  | 'max_hours_per_week'
+  | 'min_rest_between_shifts'
+  | 'max_consecutive_shifts'
+  | 'max_consecutive_shift_type'
+  | 'min_consecutive_days_off'
+  | 'max_shifts_per_period_per_week'
+  | 'forbidden_shift_sequence'
+  | 'employee_unavailable'
+  | 'employee_prefers_period'
+  | 'employee_avoids_period'
+  | 'require_role_per_shift'
+  | 'max_weekend_shifts_per_month'
+  | 'fair_distribution'
+
+export type ConstraintScope =
+  | { type: 'global' }
+  | { type: 'employee'; employee_id: string }
+  | { type: 'role'; role: string }
+  | { type: 'period'; period_id: string }
+
+export interface ConstraintJSON {
+  type: ConstraintType
+  scope: ConstraintScope
+  params: Record<string, unknown>
+  hard: boolean
+  weight?: number
+  natural_language_summary: string
+}
+
+export interface ParsedConstraintResult {
+  constraints: ConstraintJSON[]
+  ambiguities: string[]
+}

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
+}

shared/types/schedule.ts

@@ -0,0 +1,59 @@
+export interface ShiftAssignment {
+  employee_id: string
+  employee_name: string
+  shift_id: string
+  shift_name: string
+  period_id: string
+  date: string // ISO date
+  start_time: string
+  end_time: string
+}
+
+export interface SolveResult {
+  status: 'solved' | 'infeasible' | 'error'
+  assignments: ShiftAssignment[]
+  objective_value?: number
+  duration_ms?: number
+  infeasibility_hints?: Array<{ constraint_id?: string; description: string }>
+}
+
+export interface SolveInput {
+  organization_id: string
+  period_start: string
+  period_end: string
+  framework: {
+    periods: Period[]
+    shifts: Shift[]
+  }
+  employees: Employee[]
+  constraints: Array<{ id: string; constraint_json: import('./constraint').ConstraintJSON; hard: boolean; weight?: number }>
+}
+
+export interface Period {
+  id: string
+  name: string
+  start_time: string
+  end_time: string
+  color: string
+}
+
+export interface Shift {
+  id: string
+  period_id: string
+  name: string
+  duration_hours: number
+  workers_required: number
+  days_applicable: number[] // 0=Mon...6=Sun, empty = all days
+}
+
+export interface Employee {
+  id: string
+  name: string
+  roles: string[]
+  skills: string[]
+  employment_type: 'full_time' | 'part_time' | 'mini_job'
+  weekly_hours_target: number
+  max_weekly_hours: number
+  available_periods: string[]
+  unavailable_dates: string[]
+}