[BE-54] Hub settings management: backend (rebuild deleted module)

[yusuftomilola]

Overview

The hub-settings module (backend/src/hub-settings/) was removed from the working tree. Hub settings centralise operational configuration (business hours, booking rules, tax rates, branding) that currently has no management endpoint.

Context

• The original module files exist in git history but are deleted — rebuild with expanded fields
• ConfigService at backend/src/config/ for environment variable access
• Referenced by: InvoicesModule (VAT rate), BookingsModule (lead time, cancellation policy), white-labeling (FE-38)

Tasks

• Create HubSettings entity (singleton — always exactly one row, seeded on startup if absent):
  • id, hubName, address, city, country, timezone (IANA tz string, e.g. Africa/Lagos), currency (default NGN)
  • vatRatePercent (decimal, default 7.5)
  • businessHours (JSONB): { mon: { open: '09:00', close: '18:00', closed: false }, ..., sun: { closed: true } }
  • contactEmail, contactPhone
  • logoUrl (nullable), primaryColor (hex string, nullable), faviconUrl (nullable)
  • bookingLeadTimeHours (int, default 1), maxBookingDaysAhead (int, default 90)
  • cancellationPolicyHours (int, default 24)
  • updatedAt
• GET /hub-settings — returns all settings (public, no auth required — needed for white-labeling on page load)
• PATCH /hub-settings — partial update (super_admin only); validates timezone string against IANA list
• On app start, seed a default HubSettings record if the table is empty
• Register HubSettingsModule in AppModule

Files to Modify / Create

• New: backend/src/hub-settings/ (module, entity, controller, service)
• backend/src/app.module.ts

[Banx17]

Please assign this issue to me, thanks.

[Banx17]

Please assign this issue to me, thanks.