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/migrations/0002_partner_profile_payout_notifications.py

@@ -0,0 +1,70 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('partner', '0001_initial'),
+    ]
+
+    operations = [
+        # Profile extras
+        migrations.AddField(
+            model_name='partner',
+            name='bio',
+            field=models.TextField(blank=True, null=True),
+        ),
+
+        # Payout settings
+        migrations.AddField(
+            model_name='partner',
+            name='payout_account_holder_name',
+            field=models.CharField(blank=True, max_length=250, null=True),
+        ),
+        migrations.AddField(
+            model_name='partner',
+            name='payout_account_number',
+            field=models.CharField(blank=True, max_length=50, null=True),
+        ),
+        migrations.AddField(
+            model_name='partner',
+            name='payout_ifsc_code',
+            field=models.CharField(blank=True, max_length=20, null=True),
+        ),
+        migrations.AddField(
+            model_name='partner',
+            name='payout_bank_name',
+            field=models.CharField(blank=True, max_length=250, null=True),
+        ),
+        migrations.AddField(
+            model_name='partner',
+            name='payout_schedule',
+            field=models.CharField(
+                choices=[('weekly', 'Weekly'), ('biweekly', 'Bi-weekly'), ('monthly', 'Monthly')],
+                default='monthly',
+                max_length=20,
+            ),
+        ),
+
+        # Notification preferences
+        migrations.AddField(
+            model_name='partner',
+            name='notif_new_booking',
+            field=models.BooleanField(default=True),
+        ),
+        migrations.AddField(
+            model_name='partner',
+            name='notif_event_status',
+            field=models.BooleanField(default=True),
+        ),
+        migrations.AddField(
+            model_name='partner',
+            name='notif_payout_update',
+            field=models.BooleanField(default=True),
+        ),
+        migrations.AddField(
+            model_name='partner',
+            name='notif_weekly_report',
+            field=models.BooleanField(default=False),
+        ),
+    ]