Feature/node 4874 support multiple chains at anvil level

[GTC6244]

WHAT

This PR adds support for multiple blockchain chains at the Anvil level, specifically enabling a secondary "Datil" chain to run alongside the primary test chain. This allows integration tests to interact with two independent blockchain networks simultaneously, with the primary use case being testing recovery of Datil backups into Naga networks.

Key changes include:

• Addition of a KeySetIdentifier enum to specify which keyset to use in signing/encryption requests
• Extension of Anvil configuration to support multiple chain instances with different ports and state files
• New DatilTestnet component for managing the secondary chain infrastructure

[github-actions]

PASS [ 43.151s] (3/3) lit_node::test toxiproxy::perf_tests::load_with_no_latency
PASS [ 43.234s] (2/3) lit_node::test toxiproxy::perf_tests::load_with_50ms_latency_single_link
PASS [ 80.230s] (1/3) lit_node::test toxiproxy::perf_tests::load_with_50ms_latency_all_links

[Copilot]

Pull request overview

This PR adds support for multiple blockchain chains at the Anvil level, specifically enabling a secondary "Datil" chain to run alongside the primary test chain. This allows integration tests to interact with two independent blockchain networks simultaneously, with the primary use case being testing recovery of Datil backups into Naga networks.

Key changes include:

• Addition of a KeySetIdentifier enum to specify which keyset to use in signing/encryption requests
• Extension of Anvil configuration to support multiple chain instances with different ports and state files
• New DatilTestnet component for managing the secondary chain infrastructure

Reviewed changes

Copilot reviewed 42 out of 46 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
rust/lit-node/rust-toolchain.toml	Updated Rust toolchain version from 1.86 to 1.88
rust/lit-node/lit-node/tests/test_data/datil_cache/datil-node-accounts.json	Added cached Datil node account data for testing
rust/lit-node/lit-node/tests/integration/*.rs	Updated test functions to pass new key_set_identifier parameter
rust/lit-node/lit-node/tests/integration/backup_datil_long.rs	Significantly refactored to support Datil-to-Naga recovery testing with encryption/decryption validation
rust/lit-node/lit-node/tests/integration/keysets.rs	Refactored keyset addition test and extracted stress test into separate function
rust/lit-node/lit-node/src/endpoints/*.rs	Added support for optional key_set_identifier in signing/encryption endpoints
rust/lit-node/lit-node/src/tss/common/tss_state.rs	Added key_set_identifier parameter to threshold calculation
rust/lit-node/lit-node/src/tasks/fsm/epoch_change.rs	Added logic to handle restore keysets during epoch changes
rust/lit-node/lit-node/src/models/mod.rs	Added PartialEq and Eq derives to KeySetConfig
rust/lit-node/lit-node/rpc-config.example.yaml	Added RPC endpoints for anvilDatil and localchainDatil chains
rust/lit-node/lit-node-testnet/src/testnet/datil/*.rs	New module for managing Datil testnet infrastructure
rust/lit-node/lit-node-testnet/src/testnet/chain/anvil.rs	Extended Anvil to support multiple instances with different ports and state loading
rust/lit-node/lit-node-testnet/src/testnet/contracts.rs	Refactored contract loading to separate configuration application from instantiation
rust/lit-node/lit-node-testnet/src/testnet/actions.rs	Added keyset management helpers and refactored timestamp increase logic
rust/lit-node/lit-node-testnet/src/lib.rs	Added TestSetupBuilder option for including Datil testnet
rust/lit-node/lit-node-testnet/Cargo.toml	Added lit-blockchain-lite dependency for Datil contract bindings
rust/lit-node/lit-node-core/src/models/request.rs	Added KeySetIdentifier enum to signing and encryption request structures
rust/lit-core/lit-blockchain/src/resolver/rpc/config.rs	Added anvilDatil and localchainDatil to HTTPS check exclusions

Comments suppressed due to low confidence (2)

rust/lit-node/lit-node-testnet/src/testnet/datil/mod.rs:1

• Missing space between "at" and "https". Should be "at https://github.com/LIT-Protocol/lit-recovery/pull/60"

pub mod actions;

rust/lit-node/lit-node/tests/integration/keysets.rs:1

• Variable name keySetId uses inconsistent casing. Should be key_set_id to follow Rust naming conventions (snake_case).

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