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/clients/clients-view/kyc-tab/kyc-tab.component.ts

@@ -477,7 +477,8 @@ export class KycTabComponent implements OnInit, OnDestroy {
       adverseMediaMatch: !!v.adverseMediaMatch,
       // Blank stays null rather than becoming zero: an income nobody asked for is unknown, and a zero would read as a
       // customer who declared no income at all.
-      declaredAnnualIncome: v.declaredAnnualIncome === '' || v.declaredAnnualIncome == null ? null : v.declaredAnnualIncome,
+      declaredAnnualIncome:
+        v.declaredAnnualIncome === '' || v.declaredAnnualIncome == null ? null : v.declaredAnnualIncome,
       declaredAnnualTurnover:
         v.declaredAnnualTurnover === '' || v.declaredAnnualTurnover == null ? null : v.declaredAnnualTurnover
     };
@@ -522,7 +523,7 @@ export class KycTabComponent implements OnInit, OnDestroy {
       dateFormat: 'dd MMMM yyyy',
       ...this.buildDocumentFields(),
       ...this.buildRiskProfileFields(),
-        ...this.buildExceptionFields()
+      ...this.buildExceptionFields()
     };
 
     if (!this.kycId) {
@@ -769,7 +770,7 @@ export class KycTabComponent implements OnInit, OnDestroy {
       riskCategory: this.kycForm.value.riskCategory || 1,
       ...declarationFields,
       ...this.buildRiskProfileFields(),
-        ...this.buildExceptionFields()
+      ...this.buildExceptionFields()
     };
 
     this.clientsService
@@ -930,7 +931,7 @@ export class KycTabComponent implements OnInit, OnDestroy {
       riskCategory: this.kycForm.value.riskCategory || 1,
       ...receiptFields,
       ...this.buildRiskProfileFields(),
-        ...this.buildExceptionFields()
+      ...this.buildExceptionFields()
     };
 
     this.clientsService