Backfill historical Polymarket fills for one bound wallet

Runs a maker-filtered `eth_getLogs` against both Polymarket V2 exchange contracts for the wallet identified by `:id`. Only the OrderFilled row owned by the wallet is persisted to the canonical wallet-fill projection; taker-only counterparty rows are excluded. Expected yield: 5–50 rows per N-day window. ALSO backfills the wallet's external deposit/withdraw **ledger** over the same window (collateral-token Transfers, same deposit-vs-trade classifier as the live webhook) into `wallet_ledger_event` — so the PM `nav-curve` ALL-window flow adjustment is complete, not just since the webhook started; the count is returned as `ledgerFlows`. Caller must own the wallet (resolved against the caller org). Polymarket bindings only.