Fix Workers CI typecheck failure in merchants registration validation

[Copilot]

The Workers GitHub Actions job was failing at tsc --noEmit due to insufficient type narrowing in POST /api/merchants/register. Union-typed request fields (string | number) were used as strings before runtime type guards guaranteed that shape.

• Root cause in merchants.ts

  • email was passed to isValidEmail() while still typed as string | number.
  • webhookUrl could be non-string at validation time, leaving downstream string operations unsafe.

• Targeted fix

  • Tightened validation guards to require typeof email === 'string' before email validation/normalization.
  • Tightened webhook validation to require typeof webhookUrl === 'string' before URI validation.

• Resulting behavior

  • Preserves existing API contract and validation semantics.
  • Eliminates the TypeScript narrowing errors blocking the Workers pipeline.

if (typeof email !== 'string' || !isValidEmail(email)) {
  return c.json({ error: 'Validation error', details: ['"email" must be a valid email'] }, 400);
}

if (
  webhookUrl !== undefined &&
  webhookUrl !== null &&
  (typeof webhookUrl !== 'string' || !isValidUri(webhookUrl))
) {
  return c.json({ error: 'Validation error', details: ['"webhookUrl" must be a valid URI'] }, 400);
}

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