feat(investment): Daily Script Master, market rate on purchase, broken-period interest as expense

- 09 Daily Script Master now saves to and loads from the backend (sample
  rows removed), with Drop to correct a wrong rate.
- Purchase Entry takes the rate (NAV for a mutual fund) from the newest
  Daily Script Master rate on or before the deal date, shows which rate
  was used, warns when the rate entered is outside the day's low-high,
  and clears the rate when the script has none.
- Broken-period interest paid to the seller is debited to expense GL
  500606 instead of Interest Receivable (RBI UCB Investment Directions,
  para 152, confirmed by Jitendra Sir); Interest Entry labels it so.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/investment/investment.service.ts

@@ -11,6 +11,7 @@ import { HttpClient, HttpErrorResponse } from '@angular/common/http';
 import { Observable, forkJoin } from 'rxjs';
 import { map, tap } from 'rxjs/operators';
 import {
+  DailyScriptRate,
   InstrumentType,
   InvestmentHolding,
   PARTY_MASTER,
@@ -178,6 +179,27 @@ export class InvestmentService {
     );
   }
 
+  // -------------------- Daily Script Master --------------------
+  getDailyRates(scriptId?: number): Observable<InvestmentDailyRateDto[]> {
+    const params = scriptId ? `?scriptId=${scriptId}` : '';
+    return this.http.get<InvestmentDailyRateDto[]>(`/investment/daily-rates${params}`);
+  }
+
+  /** Newest Daily Script Master rate of a script on or before a date; null when none has been entered. */
+  getLatestDailyRate(scriptId: number, onDate: string): Observable<InvestmentDailyRateDto | null> {
+    return this.http.get<InvestmentDailyRateDto | null>(
+      `/investment/daily-rates/latest?scriptId=${scriptId}&onDate=${encodeURIComponent(onDate)}`
+    );
+  }
+
+  createDailyRate(body: object): Observable<{ resourceId: number }> {
+    return this.http.post<{ resourceId: number }>('/investment/daily-rates', body);
+  }
+
+  deleteDailyRate(rateId: number): Observable<unknown> {
+    return this.http.delete(`/investment/daily-rates/${rateId}`);
+  }
+
   createPurchase(body: object): Observable<{ resourceId: number; resourceIdentifier: string }> {
     return this.http.post<{ resourceId: number; resourceIdentifier: string }>('/investment/purchases', body);
   }
@@ -337,6 +359,33 @@ export interface InvestmentInterestScheduleDto {
   rows: InvestmentInterestRowDto[];
 }
 
+/** A Daily Script Master row (see InvestmentDailyRateData in the backend). */
+export interface InvestmentDailyRateDto {
+  id: number;
+  scriptId: number;
+  scriptCode: string;
+  scriptDesc: string;
+  bondType: string;
+  rateDate: string;
+  openRate: number | null;
+  highRate: number | null;
+  lowRate: number | null;
+  closeRate: number;
+}
+
+export function toDailyScriptRate(d: InvestmentDailyRateDto): DailyScriptRate {
+  return {
+    id: d.id,
+    rateDate: d.rateDate,
+    scriptCode: d.scriptCode,
+    scriptName: d.scriptDesc,
+    openRate: d.openRate,
+    closeRate: d.closeRate,
+    highRate: d.highRate,
+    lowRate: d.lowRate
+  };
+}
+
 /** The first validation / domain-rule message from a Fineract error response, for a toast. */
 export function apiErrorMessage(err: unknown): string {
   const e = err as HttpErrorResponse;