Refactor apply handlers: generic with extensions + domain auto-routing

Generic handler now accepts options (transformUrl, formDetector,
submitSelector, resumeSelector, beforeSubmit, verifySelector, etc.).
Each ATS handler passes its overrides instead of reimplementing.

Registry resolves handlers by: apply_type -> URL domain -> generic fallback.
New ATS handlers only need to export SUPPORTED_TYPES and an apply() that
calls genericApply with platform-specific options.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/apply/workday.mjs

@@ -1,12 +1,13 @@
 /**
- * workday.mjs — Workday ATS handler
- * Delegates to generic handler. Workday often requires account creation,
- * so many will return skipped_login_required — that's expected.
+ * workday.mjs — Workday ATS handler (extends generic)
+ * Most Workday sites require account creation — generic will return skipped_login_required
  */
 import { apply as genericApply } from './generic.mjs';
 
 export const SUPPORTED_TYPES = ['workday'];
 
 export async function apply(page, job, formFiller) {
-  return genericApply(page, job, formFiller);
+  return genericApply(page, job, formFiller, {
+    closedTexts: ['this job posting is no longer active'],
+  });
 }