fix(web): accept auth scheme aliases

[skyc1e]

Fixes #223.

The public AuthScheme object only exposed the friendly string values, while the lower-level wallet/faucet methods still expect the WASM enum values. That left AuthScheme.AuthRpoFalcon512 undefined and let React defaults pass an invalid auth scheme into newWallet.

This adds the numeric compatibility aliases back to the browser and Node exports, updates the public types, and routes browser newWallet / newFaucet auth inputs through resolveAuthScheme so both friendly strings and enum values reach WASM as the expected numeric enum.

Checked with:

• cmd /c ..\..\node_modules\.bin\vitest.cmd run --config vitest.config.js js/__tests__/utils.test.js
• cmd /c ..\..\node_modules\.bin\vitest.cmd run --config vitest.config.ts src/__tests__/hooks/useCreateWallet.test.tsx
• cmd /c node_modules\.bin\prettier.cmd --check crates/web-client/js/index.js crates/web-client/js/node-index.js crates/web-client/js/utils.js crates/web-client/js/types/api-types.d.ts crates/web-client/js/__tests__/utils.test.js
• git diff --check