feat: loyalty/discount system with milestone campaigns, auto-redemption, and admin UI

- Database: loyalty_redemptions, discount_campaigns, booking_discounts tables
- Backend: auto-create pending redemption at 10 stamps, apply discounts at completion
- Backend: discount_eligible flag on booking creation (user + admin flows)
- Backend: campaign CRUD handlers (GET/POST/PUT/DELETE + stats)
- Backend: milestone campaigns (per-user, global, anniversary)
- Frontend: customer account page shows 'card full' status at 10 stamps
- Frontend: admin discounts page with campaign management UI
- Frontend: TypeScript types for all discount entities
- Tests: 9 integration tests covering loyalty, campaigns, milestones, edge cases

frontend/src/lib/types/booking.ts

@@ -73,6 +73,7 @@ export interface BookingUser {
 	date_of_birth?: string;
 	account_role: string;
 	loyalty_stamps?: number;
+	pending_redemption?: boolean;
 	referral_code?: string;
 	referral_code_uses?: number;
 	created_at: string;
@@ -120,6 +121,7 @@ export interface Booking {
 	amount_paid: number;
 	amount_due: number;
 	duration_minutes: number;
+	discount_eligible?: boolean;
 }
 
 export interface BookingListResponse {
@@ -130,3 +132,60 @@ export interface BookingListResponse {
 	total_pages: number;
 }
 
+export interface LoyaltyRedemption {
+	id: string;
+	user_id: string;
+	stamps_redeemed: number;
+	status: 'pending' | 'applied' | 'expired';
+	applied_to_booking_id?: string;
+	redeemed_at: string;
+	applied_at?: string;
+	expires_at: string;
+}
+
+export type CampaignType = 'time_based' | 'milestone';
+export type MilestoneType = 'per_user_booking_count' | 'global_booking_count' | 'anniversary';
+export type MilestoneUnit = 'bookings' | 'months' | 'years';
+export type DiscountCampaignScope = 'all_bookings' | 'first_booking_only' | 'new_customers_only';
+export type DiscountCampaignStatus = 'draft' | 'active' | 'completed' | 'cancelled';
+
+export interface DiscountCampaign {
+	id: string;
+	name: string;
+	description?: string;
+	campaign_type: CampaignType;
+	discount_percent: number;
+	scope?: DiscountCampaignScope;
+	start_date?: string;
+	end_date?: string;
+	milestone_type?: MilestoneType;
+	milestone_value?: number;
+	milestone_unit?: MilestoneUnit;
+	status: DiscountCampaignStatus;
+	max_redemptions?: number;
+	times_redeemed: number;
+	created_at: string;
+	updated_at: string;
+	created_by?: string;
+}
+
+export interface BookingDiscount {
+	id: string;
+	booking_id: string;
+	user_id: string;
+	discount_source: 'loyalty' | 'campaign';
+	source_id?: string;
+	campaign_type?: CampaignType;
+	milestone_type?: MilestoneType;
+	discount_percent: number;
+	original_total: number;
+	discount_amount: number;
+	applied_at: string;
+}
+
+export interface CampaignStats {
+	campaign: DiscountCampaign;
+	total_discount_amount: number;
+	booking_count: number;
+}
+