fix: resolve 4 QA bugs found in Docker production build

- fix(member-management): Zod v4 .partial() on refined schema crash
  Separated CreateMemberBaseSchema from superRefine so .partial()
  works for UpdateMemberSchema. Fixes members-cms page crash.

- fix(course-management): snake_case→camelCase stats normalization
  getQuickStats RPC returns snake_case keys but templates expect
  camelCase. Added normalization layer so stats cards display values.

- fix(blog): add missing cover images for 5 German blog posts
  Posts referenced /images/posts/*.webp that didn't exist.

- fix(docker): remove non-existent catch_entries table from bootstrap
  dev-bootstrap.sh granted permissions on catch_entries which has no
  migration. Removed the stale reference.

- docs: add qa-checklist.md with full test report

docker/db/dev-bootstrap.sh

@@ -59,7 +59,6 @@ $PSQL -c "
   GRANT SELECT, INSERT, UPDATE, DELETE ON public.fish_stocking TO authenticated;
   GRANT SELECT, INSERT, UPDATE, DELETE ON public.fishing_leases TO authenticated;
   GRANT SELECT, INSERT, UPDATE, DELETE ON public.catch_books TO authenticated;
-  GRANT SELECT, INSERT, UPDATE, DELETE ON public.catch_entries TO authenticated;
   GRANT SELECT, INSERT, UPDATE, DELETE ON public.fishing_permits TO authenticated;
   GRANT SELECT, INSERT, UPDATE, DELETE ON public.fishing_competitions TO authenticated;
   GRANT SELECT, INSERT, UPDATE, DELETE ON public.member_clubs TO authenticated;