City partner storeCount jumps to /stores?partnerId=; normalize empty/null text so usage rule is not saved as literal "null.
Co-authored-by: Cursor <cursoragent@cursor.com>
Region partners only select districts under the chosen city; overlap errors name the occupying partner.
Co-authored-by: Cursor <cursoragent@cursor.com>
Default new sub-accounts to store:create+store:manage, backfill empty permissions on /partner/me, and treat legacy store staff as allowed to mutate.
Co-authored-by: Cursor <cursoragent@cursor.com>