feat(tempo): show resolved fee token + clean-ups

[mablr]

Motivation

Materialize Tempo default fee tokens in cast transaction building and print the resolved fee token before sending, signing, or emitting transactions across cast, forge create, and script broadcast paths.

Add no-RPC labels for well-known Tempo fee tokens and centralize the local AlphaUSD, BetaUSD, and ThetaUSD addresses for reuse in EVM core and Anvil.

Towards OSS-165

[grandizzy]

Looks good overall — couple of things to check.

[0xKarl98]

Have nothing to against it except for which have been proposed by @grandizzy

stale

[figtracer]

lgtm

[grandizzy]

Two issues with the fee-token display:

1. The main send paths (cast send / mktx / batch-mktx / tip20 / keychain) never show the default fee token, because it isn't materialized: tx.fee_token() is None unless the user passed --tempo.fee-token, so print_fee_token_selection is a no-op on the default path. This defeats the PR's goal of showing the resolved token before sending.

2. cast vaddr create materializes the default into the request (and the pre-existing paths in cast erc20 / forge create do the same). Setting fee_token = PathUSD is not wire-neutral and overrides the node's on-chain fee-token preference — the same concern raised above on tx.rs.

Recommend a single display-only resolver used by all paths, and removing the set_fee_token materializations.

stale