add config for absolute minimum utxo amount

[JssDWt]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a new configuration parameter, min_utxo_amount_sat, to enforce an absolute minimum UTXO amount for swaps. Key changes include:

• Adding a new field to the configuration in public_server.rs.
• Propagating the new parameter through the SwapParameters construction.
• Introducing a command-line argument with documentation and default value in main.rs.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
swapd/src/public_server.rs	Added a new config field and updated parameter propagation logic.
swapd/src/main.rs	Introduced a new command-line argument with corresponding docs.

Comments suppressed due to low confidence (1)

swapd/src/main.rs:527

• Ensure that the behavior of the min_utxo_amount_sat parameter is covered by tests, validating that swaps use at least the absolute minimum value.

min_utxo_amount_sat: args.min_utxo_amount_sat,

[roeierez]

LGTM