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Deposits credit a fund's available cash directly: Domain gains
CapitalPolicy (positive, two-decimal, overflow-checked amounts plus a
settle function that never touches units, NAV or realized P&L).
Persistence records deposits in fund_capital_deposits with a
fund_capital_idempotencies table, crediting cash and the deposit row
atomically under the same replay/conflict semantics as orders. The
API exposes POST /funds/{id}/capital/deposit and GET
/funds/{id}/capital/deposits behind the bearer token and idempotency
keys. The frontend adds an '追加资金' entry on the fund cash card with
in-place balance refresh, and repeats of the same amount reuse the
idempotency key so double submits credit cash exactly once. Browser
QA extends the J-series (J12-J18): invalid-amount rejection without
POST, single credited deposit with a 32-hex key, instant balance
refresh, unchanged units/cost proving no realized-income impact, and
same-key replay crediting only once.
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