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>

partner/models.py

@@ -65,5 +65,28 @@ class Partner(models.Model):
     kyc_compliance_document_file = models.FileField(upload_to='kyc_documents/', blank=True, null=True)
     kyc_compliance_document_number = models.CharField(max_length=250, blank=True, null=True)
 
+    # Profile extras
+    bio = models.TextField(blank=True, null=True)
+
+    # Payout settings
+    PAYOUT_SCHEDULE_CHOICES = (
+        ('weekly', 'Weekly'),
+        ('biweekly', 'Bi-weekly'),
+        ('monthly', 'Monthly'),
+    )
+    payout_account_holder_name = models.CharField(max_length=250, blank=True, null=True)
+    payout_account_number = models.CharField(max_length=50, blank=True, null=True)
+    payout_ifsc_code = models.CharField(max_length=20, blank=True, null=True)
+    payout_bank_name = models.CharField(max_length=250, blank=True, null=True)
+    payout_schedule = models.CharField(
+        max_length=20, choices=PAYOUT_SCHEDULE_CHOICES, default='monthly'
+    )
+
+    # Notification preferences
+    notif_new_booking = models.BooleanField(default=True)
+    notif_event_status = models.BooleanField(default=True)
+    notif_payout_update = models.BooleanField(default=True)
+    notif_weekly_report = models.BooleanField(default=False)
+
     def __str__(self):
         return self.name