Stop logging payment preimages at INFO level and import clean up - #1035
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Payment preimages are proof-of-payment and correlation material. The INFO log previously included the full preimage after a successful outbound payment, exposing it to log collectors and anyone with log access. Remove the preimage from the 'Successfully sent payment' log message in src/event.rs, retaining only the payment hash for diagnostics. The preimage remains accessible via the PaymentSuccessful event and payment store APIs.
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Closes #1029
This removes the payment preimage from the success log message in the outbound payment flow. Preimages are sensitive proof-of-payment data and shouldn't be written to logs by default. The payment hash is kept for diagnostics, and the preimage is still available via the PaymentSuccessful event for anyone who needs it.