fix(clients): stale signature bug, monthly turnover/annual income fields, senior citizen/PWD classification

- Fix signature-document reads picking the oldest upload instead of the latest across 7 call
  sites (CKYC tab, view/delete-signature dialogs, edit-wizard preview, cashier transaction entry,
  signatory service, record-master) by sorting on document id instead of an unsorted find().
- Add Monthly Turnover and Annual Income fields alongside the renamed Yearly Turnover field.
- Add Senior Citizen (auto-detected from DOB) and Person with Disability classification, with a
  required disability-certificate upload gate before client creation can proceed.
- Add Graduate and Diploma as distinct Education Levels, with diploma-specific degree options.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/ckyc/record-master/record-master.component.ts

@@ -446,8 +446,12 @@ export class RecordMasterComponent implements OnInit {
           };
         }
 
-        // 2. Signature — client document named 'clientSignature'
-        const signatureDoc = (documents as any[])?.find((d: any) => d?.name === 'clientSignature');
+        // 2. Signature — client document named 'clientSignature'. Multiple rows can exist for
+        // clients who re-cropped/replaced their signature before uploads became single-slot, so
+        // pick the highest id (latest) rather than the first unordered match.
+        const signatureDoc = (documents as any[])
+          ?.filter((d: any) => d?.name === 'clientSignature')
+          ?.sort((a: any, b: any) => b.id - a.id)?.[0];
         if (signatureDoc) {
           this.viewDetails.docs.signature = {
             present: true,