Fix failing accountService test + add PR CI workflow

[Copilot]

findByLogin failed to resolve email@example.com because the example ACCOUNT_MAP only listed aliased emails (email.A@, email.B@), not the account's own email. There was also a logic bug where execution fell through to throw after resolve().

Changes

• config/accounts.example.js — Added email@example.com to ACCOUNT_MAP["account1"] so the account's primary email is a valid login mapping
• util/accountService.js — Added return before resolve() in findByLogin to stop loop fall-through to the throw
• .github/workflows/test.yml — New workflow running npm test on every PR with permissions: contents: read

To enforce tests as a merge gate, enable "Require status checks to pass" in Settings → Branches → Branch protection rules for main and select the test job.