Fix Relay Issue

[NhoxxKienn]

This PR aims to solve the issue #50. It should update the examples to go-perun v0.15.0 and update the ethereum CI to migrate from Ganache to Hardhat developement node.

[Copilot]

Pull request overview

This PR updates the go-perun examples to version 0.15.0 and migrates the Ethereum development environment from Ganache to Hardhat. The changes consolidate peer-to-peer networking setup by integrating libp2p directly into go-perun and replacing the external perun-libp2p-wire dependency.

Changes:

• Updated go-perun dependency from v0.13.1 to v0.15.0 across all example projects
• Migrated Ethereum local node setup from Ganache CLI to Hardhat development node
• Refactored P2P bus setup to use integrated libp2p implementation from go-perun

Reviewed changes

Copilot reviewed 50 out of 57 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
payment-channel/util.go	Added setupBusWire helper function for P2P networking
payment-channel/main.go	Refactored to use new setupBusWire function instead of external libp2p library
payment-channel/package.json	Added Hardhat as development dependency
payment-channel/hardhat.config.js	Configured Hardhat node with test accounts and mining settings
payment-channel/go.mod	Updated go-perun to v0.15.0, removed perun-libp2p-wire dependency
payment-channel/README.md	Updated documentation to reflect Hardhat usage
.github/workflows/ci.yml	Updated CI workflow to use Hardhat instead of Ganache
multiledger-channel/.	Applied same migration pattern for multiledger examples
app-channel/.	Applied same migration pattern for app channel examples
payment-channel-xlm/.	Applied same migration pattern for Stellar examples
payment-channel-icp/.	Applied same migration pattern for ICP examples
payment-channel-dot/.	Applied same migration pattern for Polkadot examples
payment-channel-ckb-eth/.	Applied same migration pattern for CKB-ETH examples
payment-channel-cc/.	Applied same migration pattern for cross-contract examples

Comments suppressed due to low confidence (2)

payment-channel/hardhat.config.js:1

• The 'type' field is not a standard Hardhat configuration option. If this is a custom configuration for a specific plugin or feature, it should be documented in comments explaining its purpose.
  payment-channel/util.go:1
• The function name 'setupBusWire' is ambiguous. Consider renaming to 'setupP2PBus' or 'createP2PBusWithDialer' to better reflect that it creates a bus instance and returns a dialer.

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