Removes the unused GET /api/activities list/detail endpoints, moves the
review-queue list and resolve/unlock/unassign actions under
/api/activities, renames resolve to assign end-to-end, and drops the
now-unused store.ReviewQueue helper.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
None of these three tables gained their own user_id column -- they're
always accessed through a specific activity, so ownership is checked via a
join/subquery against activities.user_id instead.
Manual assignments are the user's definitive word and Race assignments come
from a hard Garmin fact (eventType.typeKey), not a retunable rule -- neither
is ever touched by reclassify again, and Race can no longer be set by hand
via the review queue. Adds an Activities page so this locked/unlocked status
is visible per workout, since Review Queue only ever showed unresolved items.
