The Add Balancer modal parsed its empty initial state through
BalancerFormSchema on mount and bound Form.Item validateStatus/help
directly to the result, so "Tag is required" and "Pick at least one
outbound" rendered the moment the modal opened, before any user input.
Gate the inline errors behind per-field touched tracking plus a
submit-attempted flag, and drop the disabled Create button so a save
attempt surfaces the errors (matching RuleFormModal). The existing
key-based remount in BalancersTab resets the flags on each open.
Add a regression test asserting no errors on open and errors only
after a save attempt.
nima1024m