feat(herowars): migrate JSON static imports to HttpClient assets

Replace all TypeScript JSON imports with an HWDataService that loads
6 data files from /assets/files-data/ via HttpClient with shareReplay(1).
Update all 9 consumer components to subscribe asynchronously. Remove
unused qcm-bpa.json import and dead methods from QcmComponent.
Add ADR 0013 documenting the decision.

src/app/components/herowars/herowars.component.spec.ts

@@ -1,29 +1,32 @@
 import { ComponentFixture, TestBed } from '@angular/core/testing';
 import { provideAnimations } from '@angular/platform-browser/animations';
 import { provideNativeDateAdapter } from '@angular/material/core';
+import { provideHttpClient } from '@angular/common/http';
+import { provideHttpClientTesting } from '@angular/common/http/testing';
 
 import { HerowarsComponent } from './herowars.component';
 
 describe('HerowarsComponent', () => {
-  let component: HerowarsComponent;
-  let fixture: ComponentFixture<HerowarsComponent>;
+    let component: HerowarsComponent;
+    let fixture: ComponentFixture<HerowarsComponent>;
 
-  beforeEach(async () => {
-    await TestBed.configureTestingModule({
-      imports: [HerowarsComponent],
-      providers: [
-        provideAnimations(),
-        provideNativeDateAdapter(),
-      ],
-    })
-    .compileComponents();
-    
-    fixture = TestBed.createComponent(HerowarsComponent);
-    component = fixture.componentInstance;
-    fixture.detectChanges();
-  });
+    beforeEach(async () => {
+        await TestBed.configureTestingModule({
+            imports: [HerowarsComponent],
+            providers: [
+                provideAnimations(),
+                provideNativeDateAdapter(),
+                provideHttpClient(),
+                provideHttpClientTesting(),
+            ],
+        }).compileComponents();
 
-  it('should create', () => {
-    expect(component).toBeTruthy();
-  });
+        fixture = TestBed.createComponent(HerowarsComponent);
+        component = fixture.componentInstance;
+        fixture.detectChanges();
+    });
+
+    it('should create', () => {
+        expect(component).toBeTruthy();
+    });
 });