fix: on-chain update prices return excess send mode

[vicentevieytes]

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[Copilot]

Pull request overview

This PR adjusts TON fee/cost parameters and fixes how the FeeQuoter contract returns excess TON after UpdatePrices, so excess value is sent back without risking draining the contract’s existing balance.

Changes:

• Bumped default OCR ContractTransmitter TON cost constants for commit (price-only / price+root).
• Increased on-chain FeeQuoter_Costs.updatePrices() value requirement from 0.01 TON to 0.02 TON.
• Updated FeeQuoter’s excess-return mechanism to reserve the original balance and send excess using SEND_MODE_CARRY_ALL_BALANCE.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
pkg/ccip/ocr/config.go	Updates default TON cost constants used by the OCR contract transmitter.
contracts/contracts/ccip/fee_quoter/messages.tolk	Increases the declared TON cost for updatePrices().
contracts/contracts/ccip/fee_quoter/contract.tolk	Changes excess return to reserve original balance and carry all remaining balance to the refund recipient.

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[patricios-space]

Looks good, but if you plan to run an in-place upgrade, you'll need a migrate function.