Question packs removed at the root; all subscriptions 4 assistant questions a day; Bazaar is subscription-only

- subscription.0017/0018, payment.0013: pack plans deleted, QuestionCredit/HeartsPass models and Plan.kind /
  question_credits / hearts_days / Order.question_credits / hearts_days dropped. The only paid pack order was the
  company owner's test account (user 26).
- Assistant: no credit spending; quota is the daily cap only (free 2, every plan 4, gift subscription 4).
- Bazaar: verify_purchase is subscription-only (no inapp guess), start/purchase responses lose productType,
  verify refuses an order without a subscription. A paid order with no subscription now logs ERROR.
- Removed POST /api/payment/orders (internal; no caller). Its permission tests stay.
- Pack-based tests rewritten on subscriptions (refund, security, Bazaar token); pack-only test files deleted.
- docs: profit table for 4/day on both payment routes plus free users; handbook, operations, CLAUDE.md current.
949 tests green.

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

content/tests_hearts_gate.py

@@ -18,7 +18,6 @@ from rest_framework.test import APIClient
 from accounts.authentication import issue_access_token
 from accounts.models import User
 from progress.models import UserHearts
-from subscription.models import HeartsPass
 
 from .models import Choice, Grade, Lesson, Node, Question, Unit, UserAnswer
 
@@ -100,14 +99,6 @@ class HeartsGateTests(_World, TestCase):
         self.assertEqual(self.answer(self.questions[1], correct=False).json()['heartsRemaining'], 0)
         self.assertEqual(self.finish_island().status_code, 200)
 
-    def test_unlimited_hearts_from_a_pack_are_never_blocked(self):
-        self.hearts(0)
-        HeartsPass.objects.create(user_id=self.user.id, expires_at=timezone.now() + timedelta(days=7))
-        # جزیره دو سوال دارد و پایان بی‌جواب پذیرفته نمی‌شود؛ قلبِ نامحدود هر دو جواب را می‌گیرد.
-        for question in self.questions:
-            self.assertEqual(self.answer(question, correct=False).status_code, 200)
-        self.assertEqual(self.finish_island().status_code, 200)
-
     def test_after_the_wait_a_heart_comes_back_and_play_continues(self):
         self.hearts(0, next_in=timedelta(seconds=-1))
         response = self.answer(self.questions[0], correct=True)

content/tests_paywall.py

@@ -62,9 +62,9 @@ class PaywallTests(TestCase):
 
     def test_status_reports_plan_title_and_quota(self):
         from subscription.models import Plan
-        plan = Plan.objects.get(kind='subscription', on_sale=True, duration_days=90)
+        plan = Plan.objects.get(on_sale=True, duration_days=90)
         Subscription.objects.create(user_id=self.user.id, plan=plan, status='active',
                                     expires_at=timezone.now() + timezone.timedelta(days=10))
         body = self.client.get('/api/subscription/status').json()
         self.assertEqual((body['active'], body['planTitle'], body['planDurationDays'], body['aiDailyQuota']),
-                         (True, 'سه‌ماهه', 90, 3))
+                         (True, 'سه‌ماهه', 90, 4))