chore: remove confirmed dead code

Dead code sweep verified manually against app.routes.ts, DI registries, and
cross-repo grep for every candidate (per prior false-positive incident with
knip on pages/**). Deleted only what has zero reachable reference:

Auth (unregistered, comment-only mention):
- core/auth/guards/ed25519-auth.guard.ts - ed25519AuthGuard never imported;
  only mentioned inside a doc-comment in admin-login-page.component.ts.
- core/auth/guards/permission.guard.ts - permissionGuard never imported.
- core/auth/interceptors/auth.interceptor.ts - authInterceptor not present
  in app.config.ts's withInterceptors([...]) list; not imported elsewhere.

Search feature:
- features/search/services/search-analytics.service.ts - SearchAnalyticsService
  never imported outside its own file.
- features/search/components/empty-results/* - app-search-empty-results
  selector never used in any template; search-bar.component.html implements
  its own inline @if (noResults) empty state instead.

Content management:
- features/content-management/pages/content-management-page.component.ts -
  thin wrapper around StaticPagesEditorComponent with zero route pointing at
  it in app.routes.ts. The rest of features/content-management/* (facade,
  static-pages-editor, page-editor, etc.) remains: it is used by
  project-editor and stays.

Backoffice CRUD scaffolding (re-verified the UI-COMPOSITION-REVIEW.md claim
independently): app.routes.ts backoffice section only loads
features/admin/{dashboard,products,categories,transactions,orders,customers,
moderation,users,monitoring,analytics} and features/backoffice/media. Grepped
every other backoffice/* folder for cross-references - none found.
- features/backoffice/{categories,customers,inventory,orders,products,settings}
  - each contained only a placeholder .gitkeep from the original scaffold
  commit (b957112); no real components were ever added, so this is not the
  "duplicate implementation" the prior doc described, just unused scaffold
  dirs. Removing corrects that doc's premise.
- features/backoffice/shared/backoffice-coming-soon-page.component.* - only
  consumer would have been those scaffold dirs; unreferenced elsewhere.
- assets/mock/backoffice/{customers,orders}/list.json - mock data with no
  corresponding fetch call; BackofficeDataProvider only exposes
  loadProducts()/loadCategories(), backed by the products/categories mock
  files, which are kept.

Dead shared barrels/models (no importer anywhere in src/app):
- shared/index.ts, shared/models/index.ts, shared/types/index.ts - unused
  re-export barrels.
- shared/models/domain/index.ts + user-preferences.model.ts (whole domain/
  subfolder) - UserPreferences interface has zero consumers.

Storefront pages (pages/public/platform-home.component.ts) - PlatformHomeComponent
has no route in app.routes.ts and is not imported anywhere; distinct from the
pages/category, pages/search, pages/info/**, pages/legal/**, pages/item-detail
components which ARE routed and were correctly left untouched.

Verification: npx tsc --noEmit -p tsconfig.app.json clean after each batch;
npm run build succeeded (pre-existing initial-bundle-budget warning only,
unrelated to this change).

src/app/features/search/components/empty-results/search-empty-results.component.html

@@ -1,44 +0,0 @@
-<section class="search-empty-results card" [attr.aria-label]="'search.emptyResultsAria' | translate">
-  <h3>{{ 'search.noResults' | translate }}</h3>
-
-  <button type="button" class="reset-btn" (click)="resetFilters.emit()">{{ 'catalog.clearFilters' | translate }}</button>
-
-  @if (popularCategories.length > 0) {
-    <div class="block">
-      <strong>{{ 'search.popularCategories' | translate }}</strong>
-      <div class="chip-list">
-        @for (category of popularCategories; track category.id) {
-          <button type="button" class="chip" (click)="popularCategorySelected.emit(category.id)">{{ category.label }}</button>
-        }
-      </div>
-    </div>
-  }
-
-  @if (popularSearches.length > 0) {
-    <div class="block">
-      <strong>{{ 'catalog.popularSearchesTitle' | translate }}</strong>
-      <div class="chip-list">
-        @for (item of popularSearches; track $index) {
-          <button type="button" class="chip" (click)="popularSearchSelected.emit(item)">{{ item }}</button>
-        }
-      </div>
-    </div>
-  }
-
-  @if (recommendedProducts.length > 0) {
-    <div class="block">
-      <strong>{{ 'search.recommendedProducts' | translate }}</strong>
-      <div class="product-grid">
-        @for (product of recommendedProducts; track product.itemID) {
-          <app-product-card
-            [item]="product"
-            [title]="product.name"
-            appearance="compact"
-            [addToCartLabel]="'catalog.addToCart' | translate"
-            (selected)="productSelected.emit(product)"
-            (addToCart)="productAddToCart.emit({ product, event: $event.event })" />
-        }
-      </div>
-    </div>
-  }
-</section>

src/app/features/search/components/empty-results/search-empty-results.component.scss

@@ -1,48 +0,0 @@
-.search-empty-results {
-  display: grid;
-  gap: 14px;
-  padding: 16px;
-}
-
-h3 {
-  margin: 0;
-}
-
-.reset-btn {
-  justify-self: start;
-  min-height: 40px;
-  border: 1px solid var(--border-color);
-  border-radius: var(--radius-sm);
-  background: var(--bg-primary);
-  color: var(--text-primary);
-  padding: 0 14px;
-  cursor: pointer;
-  font-weight: var(--font-weight-bold, 700);
-}
-
-.block {
-  display: grid;
-  gap: 8px;
-}
-
-.chip-list {
-  display: flex;
-  flex-wrap: wrap;
-  gap: 8px;
-}
-
-.chip {
-  min-height: 36px;
-  border: 1px solid var(--border-color);
-  border-radius: var(--radius-full, 999px);
-  background: var(--bg-primary);
-  color: var(--text-secondary);
-  padding: 0 12px;
-  cursor: pointer;
-}
-
-.product-grid {
-  display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
-  gap: 10px;
-}

src/app/features/search/components/empty-results/search-empty-results.component.ts

@@ -1,24 +0,0 @@
-import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output } from '@angular/core';
-import { Product } from '../../../../core/products/models/product-domain.model';
-import { ProductCardComponent } from '../../../../components/product-card/product-card.component';
-import { TranslatePipe } from '../../../../i18n/translate.pipe';
-
-@Component({
-  selector: 'app-search-empty-results',
-  standalone: true,
-  imports: [ProductCardComponent, TranslatePipe],
-  templateUrl: './search-empty-results.component.html',
-  styleUrls: ['./search-empty-results.component.scss'],
-  changeDetection: ChangeDetectionStrategy.OnPush
-})
-export class SearchEmptyResultsComponent {
-  @Input() popularCategories: Array<{ id: string | number; label: string }> = [];
-  @Input() popularSearches: string[] = [];
-  @Input() recommendedProducts: Product[] = [];
-
-  @Output() resetFilters = new EventEmitter<void>();
-  @Output() popularCategorySelected = new EventEmitter<string | number>();
-  @Output() popularSearchSelected = new EventEmitter<string>();
-  @Output() productSelected = new EventEmitter<Product>();
-  @Output() productAddToCart = new EventEmitter<{ product: Product; event: Event }>();
-}

src/app/features/search/services/search-analytics.service.ts

@@ -1,21 +0,0 @@
-import { Injectable } from '@angular/core';
-import { SearchAnalyticsEvent } from '../models/search.model';
-
-@Injectable({ providedIn: 'root' })
-export class SearchAnalyticsService {
-  buildEvent(input: {
-    query: string;
-    tenant: string;
-    language: string;
-    resultCount: number;
-    timestamp?: string;
-  }): SearchAnalyticsEvent {
-    return {
-      query: input.query,
-      tenant: input.tenant,
-      language: input.language,
-      timestamp: input.timestamp ?? new Date().toISOString(),
-      resultCount: input.resultCount,
-    };
-  }
-}