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>

payment/services.py

@@ -57,7 +57,7 @@ def call_payment_gateway(order: Order) -> str:
 def create_order(*, user_id: int, amount: int, currency: str = 'IRT',
                   subscription_id: int | None = None, idempotency_key: str | None = None,
                   provider: str = 'gateway', bazaar_product_sku: str = '',
-                  plan_id: int | None = None):
+                  plan_id: int | None = None, plan_title: str = ''):
     """
     ساخت سفارش با پشتیبانی از Idempotency-Key: اگر سفارشی با همین کلید قبلاً
     ساخته شده باشد، همان رکورد برگردانده می‌شود (نه رکورد تکراری)، فقط اگر
@@ -82,6 +82,8 @@ def create_order(*, user_id: int, amount: int, currency: str = 'IRT',
                 subscription_id=subscription_id,
                 plan_id=plan_id,
                 amount=amount,
+                list_price=amount,
+                plan_title=plan_title[:50],
                 currency=currency,
                 status='pending',
                 provider=provider,