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>

docs/architecture.md

@@ -256,7 +256,7 @@ temperature و با `OPENAI_CHAT_REASONING_EFFORT` صدا زده می‌شوند
 
 ## قلب‌ها، مثلِ دولینگو
 
-هر پاسخِ غلط یک قلب کم می‌کند (اشتراکِ فعال یا روزهای قلبِ بسته‌ی سوال = قلبِ نامحدود). **هر ۵ ساعت یک
+هر پاسخِ غلط یک قلب کم می‌کند (اشتراکِ فعال = قلبِ نامحدود). **هر ۵ ساعت یک
 قلب برمی‌گردد** (`HEART_REFILL_INTERVAL`) و **۲۴ ساعت بعد از اولین قلبی که از
 حالتِ پر کم شد، همه یک‌جا پر می‌شوند** (`HEART_FULL_REFILL_AFTER`، فیلدِ
 `full_refill_at`). `GET /api/user/hearts` هر دو زمان را می‌دهد: `nextRefillAt`