The balance column on the paywall's stat card showed summed account
balances per currency (e.g. "58.031 MXN 65 US$"). As a variable-length,
multi-currency string it overflowed the card on mobile and broke the
four-column layout. The remaining stats (accounts, transactions,
categories) are short integer counts, so dropping balance leaves a clean
three-column row.
Also removes the now-unused per-account balance computation in
getUserStats (which ran an N+1 query — one AccountBalance lookup per
account) and the never-rendered automationRulesCount stat, so the
endpoint only ships data the paywall actually displays.
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