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>

config/tests.py

@@ -6,7 +6,7 @@ from urllib.parse import urlsplit
 from unittest.mock import patch
 
 from django.conf import settings
-from django.test import RequestFactory, SimpleTestCase, TestCase
+from django.test import RequestFactory, SimpleTestCase, TestCase, override_settings
 from rest_framework.test import APIClient
 
 from accounts.authentication import issue_access_token
@@ -476,3 +476,14 @@ class ApiDocsRtlShellTests(TestCase):
     def test_redoc_carries_the_rtl_shell(self):
         html = self.client.get('/api/redoc/').content.decode()
         self.assertIn('direction: rtl', html)
+
+
+class InsecureSecretKeyWarningTests(TestCase):
+    """کلیدِ کامیت‌شده‌ی django-insecure در پروداکشن باید در /api/health دیده شود (۲۰۲۶-۱۰-۰۳)."""
+
+    def test_committed_key_is_reported(self):
+        from config import health
+        with override_settings(DEBUG=False, SECRET_KEY='django-insecure-xyz'):
+            self.assertIn('django-insecure', ' '.join(health._warnings()))
+        with override_settings(DEBUG=False, SECRET_KEY='a-real-random-key'):
+            self.assertNotIn('django-insecure', ' '.join(health._warnings()))