ENG-396: Create ETH-USDT receive address during account creation

[forge0x]

Summary

Creates an Ethereum USDT IBEX crypto receive address during Flash account creation, after the ETH-USDT Cash Wallet / IBEX account is created.

This keeps the code on the same IBEX receive-info path that ENG-395 can later expose through GraphQL/mobile.

Changes

• During account bootstrap, after selecting the ETH-USDT wallet as the default Cash Wallet:
  • fetches the Ethereum USDT receive option from IBEX
  • creates one crypto receive-info for the ETH-USDT wallet
  • stores the returned address on account.bridgeEthereumAddress
• Account creation fails if required ETH-USDT receive-info creation fails, avoiding a partially provisioned account.
• Adds focused unit coverage for success and failure behavior.

Out of scope

• GraphQL/mobile receive-address API — ENG-395
• Crypto receive webhook alignment — ENG-296
• Bridge virtual-account behavior — dedicated Bridge VA tickets

Verification

• RED observed before implementation: new account-creation tests failed because IBEX receive-info creation was not called.
• PASS: LOGLEVEL=warn ../../node_modules/.bin/jest --config ./test/flash/unit/jest.config.js --bail --verbose test/flash/unit/app/accounts/create-account.spec.ts
• PASS: git diff --check
• PASS: ../../node_modules/.bin/tsc --noEmit -p tsconfig.d.json
• PASS: ../../node_modules/.bin/eslint --no-ignore src/app/accounts/create-account.ts test/flash/unit/app/accounts/create-account.spec.ts
• NOTE: full ../../node_modules/.bin/tsc --noEmit still fails on inherited baseline legacy/test type errors unrelated to this PR.

Linear: ENG-396

[linear]

ENG-396