Audit fixes 2026-10-03: seed keeps admin edits, plan cache, refresh limit, payment and tutor guards

- seed_content no longer undoes admin work: a SeedRecord ledger (content/seed_sync.py)
  stops deleted/renamed/re-worded content from being recreated and keeps admin-edited
  lesson text; new rows in the seed files still arrive (migration content.0010)
- plan list cache is invalidated on Plan save (receiver used a stale 'v1' key)
- token refresh per-IP cap 30/hour -> 600/hour (TOKEN_REFRESH_IP_RATE)
- a failed gateway result only changes a pending order (forged NOK no longer
  overwrites refunded/canceled)
- tutor gets the correct answer only after the student has answered
- support reply notification moved to a TicketMessage post_save signal
- global daily cap on paid AI questions (AI_GLOBAL_DAILY_MAX, default 3000)
- Bazaar verify uses only the order's SKU; bazaar orders require a SKU
- /api/health warns on the committed signing key; deploy.sh saves local commits;
  400 for bad ?unit= / ?period=; account delete keeps the referrer's Conversion
- earlier today: no stub answers outside DEBUG, ?grade= removed, logged fallbacks

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

support/admin.py

@@ -1,5 +1,4 @@
 from django.contrib import admin
-from django.db import transaction
 
 from .models import BugReport, Ticket, TicketMessage
 
@@ -30,26 +29,5 @@ class TicketMessageAdmin(admin.ModelAdmin):
     list_display = ('id', 'ticket', 'sender', 'created_at')
     list_filter = ('sender',)
 
-    def save_model(self, request, obj, form, change):
-        """
-        طبق سند معماری، ارتباط Support→Notifications فقط از طریق رویداد
-        TicketReplied‌ه، نه رفرنس مدل. چون پاسخ پشتیبانی (sender='support')
-        از پنل ادمین ثبت می‌شه، رویداد دقیقاً همین‌جا ساطع می‌شه — همون
-        الگوی notify() که در payment/views.py (PaymentWebhookView) هنگام
-        پرداخت موفق (status=paid) صدا زده می‌شه.
-        """
-        is_new = obj.pk is None
-        # ⚛️ atomic: ذخیره‌ی پیام پشتیبانی + ساختِ Notification یک واحدند.
-        with transaction.atomic():
-            super().save_model(request, obj, form, change)
-
-            if is_new and obj.sender == 'support':
-                from notifications.services import notify
-
-                notify(
-                    user_id=obj.ticket.user_id,
-                    type='ticket_replied',
-                    title='پاسخ جدید برای تیکت شما',
-                    body=obj.text[:200],
-                    related_id=obj.ticket_id,
-                )
+    # اعلانِ پاسخِ پشتیبانی در support/receivers.py است (سیگنال روی مدل)، نه این‌جا؛ از صفحه‌ی
+    # تیکت (inline) هم که ذخیره شود اعلان می‌رود.