feat(rbi-reserve,savings): Form 1/Form 9 returns UI, branch-wise interest posting reports and summary

- Reports > Interest Posting Reports: per branch and product, generate/regenerate
  at any time, approve; branch column, HO-on-behalf marker, posted txn per account
- Reports > Interest Posting Summary (branch-wise) for the head office, with Excel export
- Day Close warns and disables Close Day while the branch's interest report is unapproved
- Savings product accounting: Interest On Savings (expense), Savings Interest Payable
  and Paid (liability rows, required)
- RBI Form 1 statutory and Form 9 return screens, reserve config updates
- Interest posting report GETs exempted from the response cache

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/app/organization/tds-config/tds-config.component.ts

@@ -37,7 +37,10 @@ interface FieldDef {
 @Component({
   selector: 'mifosx-tds-config',
   templateUrl: './tds-config.component.html',
-  styleUrls: ['../rbi-reserve-config/rbi-reserve-config.component.scss', './tds-config.component.scss'],
+  styleUrls: [
+    '../rbi-reserve-config/rbi-reserve-config.component.scss',
+    './tds-config.component.scss'
+  ],
   imports: [
     ...STANDALONE_SHARED_IMPORTS,
     FormsModule
@@ -67,7 +70,12 @@ export class TdsConfigComponent implements OnInit {
 
   readonly rateFields: FieldDef[] = [
     { key: 'thresholdGeneral', label: 'Threshold – general (₹)', kind: 'amount', hint: 'Payee below 60' },
-    { key: 'thresholdSenior', label: 'Threshold – senior citizen (₹)', kind: 'amount', hint: '60 at any time in the year' },
+    {
+      key: 'thresholdSenior',
+      label: 'Threshold – senior citizen (₹)',
+      kind: 'amount',
+      hint: '60 at any time in the year'
+    },
     { key: 'ratePanPercentage', label: 'Rate – valid PAN (%)', kind: 'percent' },
     { key: 'rateNoPanPercentage', label: 'Rate – PAN missing / invalid (%)', kind: 'percent' },
     { key: 'lateDeductionPercentage', label: 'Late deduction interest (% per month)', kind: 'percent' },
@@ -96,7 +104,12 @@ export class TdsConfigComponent implements OnInit {
         { value: 'QUARTERLY', label: 'Quarterly' }
       ]
     },
-    { key: 'declarationStatementDueDay', label: 'Statement due on day', kind: 'int', hint: 'Of the following month / quarter' }
+    {
+      key: 'declarationStatementDueDay',
+      label: 'Statement due on day',
+      kind: 'int',
+      hint: 'Of the following month / quarter'
+    }
   ];
 
   readonly statuteFields: FieldDef[] = [