chore: update deps and version bump

[Fraser999]

Summary

Updates the Signet SDK crates and init4-bin-base to their latest releases, bumps the workspace crate version, and refreshes the example configs/docs to the current testnet. No source changes were required - the bump is API-compatible.

Changes

• Bump the signet-* crates (signet-constants, signet-orders, signet-tx-cache, signet-types, signet-zenith) 0.16.3 → 0.19.0 and init4-bin-base 0.19.0 → 0.23.1.
• Bump the workspace crate version 0.1.0 → 0.1.1.
• Move the yanked metrics 0.24.5 → 0.24.6 (pulled in transitively by the init4-bin-base bump).
• Refresh .cargo/audit.toml: drop the now-stale rand RUSTSEC-2026-0097 ignore (the bump moves rand off the affected 0.8.5) and add RUSTSEC-2026-0173 (proc-macro-error2 unmaintained).
• Update the web and tui example READMEs from the Parmigiana to the Gouda testnet (RPC/tx-cache URLs and CHAIN_NAME).
• Document the examples/tui and examples/web directories in CLAUDE.md.

Notes

• The version change is a patch bump because the public API is unchanged: cargo-public-api reports an empty diff for both crates across the dependency update, even though dep types appear throughout their public surface.
• The new Gouda endpoints were validated live - eth_chainId on the host and rollup RPCs returns 3151908 and 792669, matching signet-constants' gouda HOST_CHAIN_ID / RU_CHAIN_ID, and transactions.gouda.signet.sh matches the SDK's TX_CACHE_URL.
• cargo audit (exit 0), cargo clippy (default and --no-default-features), and the full test suite all pass.

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[Fraser999]

• chore: update deps and version bump #6 👈 (View in Graphite)
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