fix: add missing OneKey module export parity across package targets

[marcelosalloum]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Bug fix + docs update.

• What is the current behavior? (You can also link to an open issue here)

OneKey support exists in source (onekey.module.ts) and is included in defaultModules, but it was missing from some public/export surfaces. Specifically, src/deno.json and npm build entry points were not fully aligned, and wallet documentation lists were out of date.

These entries were missed from PR #80 .

• What is the new behavior (if this is a feature change)?

OneKey is now consistently included in package export/entrypoint definitions and docs:

• Added ./modules/onekey export mapping in src/deno.json

• Added ./modules/onekey entry point in src/build_npm.ts

• Added OneKey to supported wallets docs and README compatibility list

• Other information:

No API behavior changes beyond exposing the already-implemented OneKey module through all documented/public paths.