feat(i18n): compute bilingual label on giving/ministry/expense-category lookups

APP/src/app/features/giving/models/giving.model.ts

@@ -18,6 +18,8 @@ export interface GivingCategoryDto {
   description_zh: string | null;
   isActive: boolean;
   sortOrder: number;
+  /** Display-only bilingual label, computed in the API service. */
+  label?: string;
 }
 export interface CreateGivingCategoryRequest {
   name_en: string;

APP/src/app/features/giving/services/giving-category-api.service.ts

@@ -1,6 +1,7 @@
 import { Injectable } from '@angular/core';
 import { HttpClient, HttpParams } from '@angular/common/http';
-import { Observable } from 'rxjs';
+import { Observable, map } from 'rxjs';
+import { bilingual } from '../../../shared/i18n/bilingual';
 import { ApiConfigService } from '../../../core/services/api-config.service';
 import {
   GivingCategoryDto, CreateGivingCategoryRequest, UpdateGivingCategoryRequest,
@@ -15,7 +16,9 @@ export class GivingCategoryApiService {
 
   getAll(includeInactive = false): Observable<GivingCategoryDto[]> {
     const params = new HttpParams().set('includeInactive', includeInactive);
-    return this.http.get<GivingCategoryDto[]>(this.endpoint, { params });
+    return this.http.get<GivingCategoryDto[]>(this.endpoint, { params }).pipe(
+      map(list => list.map(c => ({ ...c, label: bilingual(c.name_en, c.name_zh) }))),
+    );
   }
   create(request: CreateGivingCategoryRequest): Observable<{ id: number }> {
     return this.http.post<{ id: number }>(this.endpoint, request);