Function parse_current_order_fill_report 

pub fn parse_current_order_fill_report(
    order: &CurrentOrderSummary,
    account_id: AccountId,
    currency: Currency,
    ts_init: UnixNanos,
) -> Result<FillReport>

Parses a Betfair CurrentOrderSummary into a Nautilus [FillReport].

Uses cumulative size_matched and average_price_matched to produce a single fill representing the total execution. Trade IDs use the format {bet_id}-{size_matched} for deterministic uniqueness.

Errors

Returns an error if timestamps or decimal values cannot be parsed.