New GET /api/trading/positions/history lists closed plans (entry filled,
position back to zero) newest first with before/limit paging. Each row
carries the filled quantity, volume-weighted entry and exit prices from
the plan's own fills, the close reason and the realized PnL, commission
and net from the plan result.
The positions panel gets a "历史仓位" button that opens a drawer with the
table, a "load earlier" button and links to each plan's analysis.
eezd
fb63ebb697