refactor: redesign admin permalinks to RESTful paths

- Replace fragile /admin/ai-playground and /admin/ai-generation routes
  with item-scoped /admin/questions/{id}/generate endpoints
- Add /admin/tryouts/{id}/questions route using Tryout primary key
  instead of composite query params (?tryout_id=X&website_id=Y)
- Fix variant detail and review-bulk endpoints to use scoped paths
- Update all internal links (dashboard, hierarchy, exams) to new routes
- Remove obsolete ai_playground_view/submit/save functions

alembic.ini

@@ -84,7 +84,7 @@ path_separator = os
 # database URL.  This is consumed by the user-maintained env.py script only.
 # other means of configuring database URLs may be customized within the env.py
 # file.
-sqlalchemy.url = postgresql+asyncpg://postgres:postgres@localhost:5432/irt_bank_soal
+sqlalchemy.url = driver://user:pass@localhost/dbname
 
 
 [post_write_hooks]