chore: disable debug RPC namespace

[matthias-wright]

No description provided.

[github-actions]

Disables the entire debug RPC namespace for privacy/security in Seismic nodes.

Phase 1

• crates/seismic/node/src/node.rs:376 — The type annotation <fn(&str) -> bool> on methods_by_module call is invalid. The function signature is pub fn methods_by_module(&self, module: RethRpcModule) -> Methods — it doesn't accept generic type parameters. Remove the type annotation: modules.methods_by_module(RethRpcModule::Debug).

LGTM otherwise. Disabling debug methods is a solid security measure for a privacy-focused client — these methods expose detailed execution traces, account state enumeration, and transaction replay capabilities that could compromise confidential transaction privacy.