feat(organisation): add contact fields to model and API

Add contact_name, contact_email, phone, website columns. Wire the new
fields through the Organisation model, update request validation,
response resource, and the TypeScript Organisation interface. Needed by
the upcoming dashboard + form-builder binding registry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/app/src/types/organisation.ts

@@ -2,6 +2,10 @@ export interface Organisation {
   id: string
   name: string
   slug: string
+  contact_name: string | null
+  contact_email: string | null
+  phone: string | null
+  website: string | null
   billing_status: 'trial' | 'active' | 'suspended' | 'cancelled'
   settings: Record<string, unknown> | null
   email_logo_url: string | null
@@ -23,6 +27,10 @@ export interface OrganisationMember {
 export interface UpdateOrganisationPayload {
   name?: string
   slug?: string
+  contact_name?: string | null
+  contact_email?: string | null
+  phone?: string | null
+  website?: string | null
   billing_status?: Organisation['billing_status']
   settings?: Record<string, unknown>
   email_logo_url?: string | null