Add a Quiz Questions content page (list/filter/create/edit/activate-
deactivate, no delete since quiz_answers reference questions by id),
route it under manage_questions, and add a sidebar entry.
Fix DaresPage so intensity (1-5) is editable and shown in the table;
previously every admin-created dare silently defaulted to intensity 1.
Add authored min/max intensity fields to DarePacksPage: no trigger or
worker in apps/api computes these columns, so they are admin-set
thresholds gating pack visibility, not derived aggregates. avg_intensity
is displayed read-only since nothing writes to it and it is not used
for filtering.
Extract dare intensity and quiz option validation into small lib
modules with focused unit tests.
