Initial commit: TravelHub multi-tenant flight booking platform

Angular + Go + PostgreSQL sample with strict per-tenant isolation.

- Backend: Go API (basic auth, tenant-scoped repository layer, pgx pool)
- Frontend: Angular 22 SPA (search, checkout, bookings, dashboard)
- Database: schema, seed data and demo bookings migrations
- Tests: 311 across Go (integration), Angular (unit) and Playwright (e2e),
  plus a generated evidence report with PDF export
- Security: whitebox VAPT report under security/

Secrets (.env, tokens, DB credentials) are git-ignored.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/go.mod

@@ -0,0 +1,17 @@
+module github.com/travelswitch/travelhub/backend
+
+go 1.26.0
+
+require (
+	github.com/google/uuid v1.6.0
+	github.com/jackc/pgx/v5 v5.11.0
+	golang.org/x/crypto v0.57.0
+)
+
+require (
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	golang.org/x/sync v0.23.0 // indirect
+	golang.org/x/text v0.42.0 // indirect
+)