public user IDs, plans priced by tutor cost, age-based tutor tone, self-service account deletion

- profile publicId ("User482917", accounts/public_id.py); admin shows and searches it
- plans API reports aiDailyQuota per plan and freeAiDailyQuota; migration 0007 sets the
  temporary prices (monthly 99,000 / yearly 990,000 toman, 5 tutor questions a day) unless
  an admin already edited the yearly plan
- tutor tone follows the learner's age (18+ gets an adult tone at any grade); notation
  still follows the grade's book; answer cache keyed by tone (prompt tutor-v12-age-tone)
- POST /api/user/delete: phone users confirm with a fresh SMS code (same checks as login,
  now shared in verify_phone_otp), guests type "حذف"; payment records are kept, demo
  accounts refused
- delete_users --skip-paid

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

ai_tutor/views.py

@@ -28,6 +28,22 @@ from .serializers import (
 
 logger = logging.getLogger(__name__)
 
+def _learner_age(user) -> int | None:
+    """سنِ کاربر از پروفایلش (accounts)؛ لحنِ دستیار برای ۱۸+ بزرگسالانه است."""
+    from accounts.jalali import age_of
+    from accounts.models import Profile
+
+    profile = Profile.objects.filter(user_id=user.id).only('birth_date', 'birth_year').first()
+    return age_of(profile.birth_date, profile.birth_year) if profile else None
+
+
+def _cache_grade(grade_title: str, age: int | None) -> str:
+    """پایه در کلیدِ کشِ جواب، با لحن: جوابِ بزرگسالانه به کودک سرو نشود و برعکس."""
+    from rag.services.generation import tone_for
+
+    return f'{grade_title}|adult' if tone_for(grade_title, age) == 'adult' else grade_title
+
+
 def daily_quota(user_id: int) -> int:
     """سقفِ سوالِ روزانه‌ی این کاربر؛ رایگان یا از پلنِ اشتراکش (subscription.services)."""
     from subscription.services import ai_daily_quota
@@ -368,6 +384,7 @@ class AskAIView(APIView):
         from rag.services import guardrails
 
         screened = guardrails.screen(v['userQuestion'])
+        age = _learner_age(user)
 
         # --- مسیرِ استریم (SSE) --- فقط وقتی stream=true و RAG پیکربندی‌شده.
         # قراردادِ JSONِ غیراستریم دست‌نخورده می‌ماند؛ Swagger که stream
@@ -381,7 +398,7 @@ class AskAIView(APIView):
                     user_message=user_message, conversation_is_new=conversation_is_new,
                     idempotency_key=idempotency_key, used_today=used_today,
                     subject=subject, grade_id=grade_id, grade_title=grade_title,
-                    lesson_number=lesson_number, screened=screened, quota=quota,
+                    lesson_number=lesson_number, screened=screened, quota=quota, age=age,
                 )
 
         used_chunks: list[dict] = []
@@ -404,7 +421,7 @@ class AskAIView(APIView):
                 focus = _question_focus(v, user)
                 cacheable = answer_cache.cacheable(history) and not focus
                 _col, _fk, _fv = resolve_target(subject, grade_title, grade_id, lesson_number)
-                cache_key = answer_cache.make_key(_col, _fv, v['userQuestion'], grade_title)
+                cache_key = answer_cache.make_key(_col, _fv, v['userQuestion'], _cache_grade(grade_title, age))
                 cached = answer_cache.get(cache_key) if cacheable else None
                 if cached is not None:
                     answer_text = cached['answer']
@@ -426,7 +443,7 @@ class AskAIView(APIView):
                     answer_text, follow_ups, generation_meta = generate_answer(
                         v['userQuestion'], used_chunks or None,
                         retrieval_meta.get('gradeTitle') or grade_title or '',
-                        history=history, focus=focus,
+                        history=history, focus=focus, age=age,
                     )
                     provider_status.record_success()
                     # ردِ «غیرِ ریاضی» نه منبعِ کتاب نشان می‌دهد نه کش می‌شود.
@@ -508,7 +525,8 @@ class AskAIView(APIView):
 
     def _streaming_response(self, *, request, v, user, conversation, user_message,
                             conversation_is_new, idempotency_key, used_today,
-                            subject, grade_id, grade_title, lesson_number, screened=None, quota=None):
+                            subject, grade_id, grade_title, lesson_number, screened=None, quota=None,
+                            age=None):
         """
         نسخه‌ی SSE از post(): همون منطقِ retrieval + کوتا + idempotency، ولی
         پاسخ توکن‌به‌توکن استریم می‌شه. رویدادها:
@@ -531,7 +549,7 @@ class AskAIView(APIView):
             generation_meta: dict = {}
             answer_from_cache = False
             _col, _fk, _fv = resolve_target(subject, grade_title, grade_id, lesson_number)
-            cache_key = answer_cache.make_key(_col, _fv, v['userQuestion'], grade_title)
+            cache_key = answer_cache.make_key(_col, _fv, v['userQuestion'], _cache_grade(grade_title, age))
             try:
                 history = _conversation_history(conversation, user_message)
                 focus = _question_focus(v, user)
@@ -566,7 +584,7 @@ class AskAIView(APIView):
                     effective_grade = retrieval_meta.get('gradeTitle') or grade_title or ''
                     for delta in stream_answer(
                         v['userQuestion'], used_chunks or None, effective_grade,
-                        history=history, focus=focus, result=stream_result,
+                        history=history, focus=focus, result=stream_result, age=age,
                     ):
                         parts.append(delta)
                         yield _sse('chunk', {'delta': delta})