feat(partner-portal): Sprint 1 — partner-me settings endpoints

Add 4 self-service endpoints under /api/v1/partners/me/:
- GET/PUT  /partners/me/profile/      → name, email, phone, website, bio
- GET/PUT  /partners/me/notifications/ → 4 boolean notification prefs
- GET/PUT  /partners/me/payout/        → bank account + payout schedule
- POST     /partners/me/change-password/ → current+new password change

Model changes (partner/models.py + migration 0002):
- Partner.bio TextField
- Partner.payout_* fields (holder name, account number, IFSC, bank name, schedule)
- Partner.notif_* boolean fields (new_booking, event_status, payout_update, weekly_report)

Auth: simplejwt Bearer token (same as all admin_api views).
Role guard: _require_partner() enforces partner/partner_manager/partner_staff
and verifies user.partner FK is non-null.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin_api/urls.py

@@ -21,6 +21,11 @@ urlpatterns = [
     path('partners/<int:pk>/impersonate/', views.PartnerImpersonateView.as_view(), name='partner-impersonate'),
     path('partners/onboard/', views.PartnerOnboardView.as_view(), name='partner-onboard'),
     path('partners/<int:partner_id>/staff/', views.PartnerStaffCreateView.as_view(), name='partner-staff-create'),
+    # Partner-Me: partner portal self-service (Sprint 1)
+    path('partners/me/profile/', views.PartnerMeProfileView.as_view(), name='partner-me-profile'),
+    path('partners/me/notifications/', views.PartnerMeNotificationsView.as_view(), name='partner-me-notifications'),
+    path('partners/me/payout/', views.PartnerMePayoutView.as_view(), name='partner-me-payout'),
+    path('partners/me/change-password/', views.PartnerMeChangePasswordView.as_view(), name='partner-me-change-password'),
     path('users/metrics/', views.UserMetricsView.as_view(), name='user-metrics'),
     path('users/', views.UserListView.as_view(), name='user-list'),
     path('users/<int:pk>/', views.UserDetailView.as_view(), name='user-detail'),