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/clients/create-client/create-client.component.ts

@@ -331,6 +331,18 @@ export class CreateClientComponent {
         return;
       }
 
+      // PWD gate — disability type + certificate are mandatory when PWD is checked
+      // (Senior Citizen proof upload is optional, not gated here)
+      if (!this.clientGeneralStep?.seniorPwdDocsComplete) {
+        this.clientGeneralStep?.markSeniorPwdDocsTouched();
+        this.snackBar.open(
+          'Select the disability type and upload the Disability Certificate before continuing.',
+          'Close',
+          { duration: 5000 }
+        );
+        return;
+      }
+
       // Sanctions verification gate — Verify Client must be clicked before save
       if (!this.clientGeneralStep?.sanctionsVerified) {
         this.dialog
@@ -469,6 +481,29 @@ export class CreateClientComponent {
         clearInterval(progressInterval);
         this.saveProgress = 100;
         this.createdClientId = response.resourceId;
+
+        // Senior Citizen / PWD supporting documents — uploaded after creation, same pattern as
+        // the KYC step's photo/signature uploads (the generic /clients/{id}/documents endpoint
+        // needs a real clientId, which only exists once createClient() has returned).
+        if (this.clientGeneralStep?.seniorCitizenProofFile) {
+          const seniorCitizenProofForm = new FormData();
+          seniorCitizenProofForm.append('file', this.clientGeneralStep.seniorCitizenProofFile);
+          seniorCitizenProofForm.append('name', 'seniorCitizenProof');
+          seniorCitizenProofForm.append('description', 'Senior Citizen Proof (Age/ID Proof)');
+          this.clientsService
+            .uploadClientDocument(this.createdClientId, seniorCitizenProofForm)
+            .subscribe({ error: () => {} });
+        }
+        if (this.clientGeneralStep?.pwdCertificateFile) {
+          const pwdCertificateForm = new FormData();
+          pwdCertificateForm.append('file', this.clientGeneralStep.pwdCertificateFile);
+          pwdCertificateForm.append('name', 'pwdCertificate');
+          pwdCertificateForm.append('description', 'Disability Certificate');
+          this.clientsService
+            .uploadClientDocument(this.createdClientId, pwdCertificateForm)
+            .subscribe({ error: () => {} });
+        }
+
         // Brief delay to show 100% before transitioning
         setTimeout(() => {
           this.savingClient = false;