Record x402 Token Top-Up

Credits a fixed 500-token top-up. Reachable only once app.main's x402 payment middleware has already cryptographically verified a $5.00 payment for this exact route via the configured facilitator - this handler never reads an amount from the request, because there is no amount in the request at all. The on-chain settlement itself completes after this handler returns, so a payment that verifies but later fails to settle (a narrow, accepted window) is still credited; see topup_ledger_x402's own docstring.

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