senior's post-demo changes: parent report in the student's own account, Jalali birth date, invoices, math-only tutor, priced quotas

- remove the family app from the root (separate parent accounts, invite codes, parental
  settings); progress.0006 drops its tables, permissions and migration history, and
  Profile.parent_phone, the two family notification types and ?userId= on
  /api/progress/nodes go with it
- GET /api/user/weekly-report: last 7 days next to the 7 before (estimated minutes,
  questions, accuracy, islands, tutor questions) for the "parent report" page
- profile birthDate in Jalali (accounts/jalali.py), ages 5-99, birthYear derived from it
- GET /api/payment/invoices; orders now snapshot list price and plan title
- tutor answers only math: server pre-filter, scope rule in the prompt (tutor-v11),
  refusal marker replaced with fixed text; self-harm gets a help line instead
- streamed answers now record token usage (it was always 0)
- daily tutor quota: AI_DAILY_QUOTA_FREE (default 3) vs Plan.ai_daily_quota
- delete_users management command for wiping test accounts across every app
- docs/ai-cost-and-guardrails.md: measured cost per question and guardrail results

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

config/tests_audit_round2.py

@@ -16,7 +16,6 @@ from accounts.authentication import issue_access_token
 from accounts.models import User
 from content.models import Choice, Grade, Lesson, Node, Question, Unit
 from discount.models import Offer
-from family.models import FamilyLink
 from payment.models import Order
 from payment.services import apply_order_payment_result
 from subscription.models import Plan, Subscription
@@ -100,7 +99,9 @@ class ZarinpalErrorBodyReturnsToApp(_Base):
 
 
 class WeeklyReportCountsIslands(TestCase):
-    def test_island_quiz_xp_reaches_the_parent(self):
+    # تا ۲۰۲۶-۱۰-۰۱ همین سناریو گزارشِ والد را از /api/family/weekly-report می‌خواند؛
+    # آن اپ حذف شد و گزارش حالا در حسابِ خودِ دانش‌آموز است.
+    def test_island_quiz_xp_reaches_the_weekly_report(self):
         cache.clear()
         grade = Grade.objects.create(title='پایه نهم', icon='', color='')
         node = Node.objects.create(unit=Unit.objects.create(grade=grade, title='فصل', order=1),
@@ -118,14 +119,11 @@ class WeeklyReportCountsIslands(TestCase):
         child_client.post(f'/api/nodes/{node.id}/quiz/complete',
                           {'correctCount': 4, 'totalQuestions': 4}, format='json')
 
-        parent = User.objects.create(phone='09120008003')
-        FamilyLink.objects.create(parent_user_id=parent.id, child_user_id=child.id,
-                                  child_phone=child.phone, invite_code='654321',
-                                  status='accepted', accepted_at=timezone.now())
-        report = _client(parent).get('/api/family/weekly-report').json()
-        self.assertEqual(report['xpEarned'], 40)
-        self.assertEqual(report['islandsCompleted'], 1)
-        self.assertEqual(report['lessonsCompleted'], 0)
+        week = child_client.get('/api/user/weekly-report').json()['thisWeek']
+        self.assertEqual(week['xp'], 40)
+        self.assertEqual(week['islands'], 1)
+        self.assertEqual(week['lessons'], 0)
+        self.assertEqual((week['questions'], week['correct']), (4, 4))
 
 
 class AskWithNonNumericQuestionId(TestCase):