fix(admin): products canDeactivate guard, unblock npm, drop dead deps

RC-01 Phase 1 mechanical fixes (verified against current repo state,
not blindly reapplied from TODO.md):

- admin/products create/edit/duplicate now protected by an unsaved-
  changes guard (adminProductDirtyGuard), mirroring the existing
  categories pattern. AdminProductsFacade had zero dirty-tracking
  before this - added a dirty signal, set true on updateDraft(),
  cleared on load/create/successful save. Added confirmLeaveUnsaved
  to the adminProducts i18n section (en/ru/hy) - categories already
  had its own copy of this key, products didn't.
- barry-cache bumped ^0.1.0 -> ^0.9.3 (the pinned range no longer
  resolved on the registry - ETARGET - which had been silently
  blocking every npm install/uninstall all cycle).
- Removed primeng/primeicons (npm uninstall, now unblocked) - the
  only consumer (items-carousel) was already deleted in RC PERF-01.
- Removed core/search/services/search-history.service.ts, a dead
  1-line re-export with zero importers (verified: the real
  implementation is features/search/services/search-history.service.ts,
  used by search.facade.ts). Left core/search/models/* alone - those
  ARE live, imported by catalog components.

Verified before touching: HeaderConfig.showProfile toggle is already
removed from the header-section editor template (TODO.md was stale on
this one) - no change needed, will correct the tracking doc separately.

tsc --noEmit clean, npm run build green (bundle unchanged, primeng
was already tree-shaken out, this just removes the dead dependency
declaration itself).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/app.routes.ts

@@ -4,6 +4,7 @@ import { projectEditorDirtyGuard } from './features/project-editor/guards/projec
 import { adminAuthGuard } from './core/admin-auth/admin-auth.guard';
 import { authRoutes } from './core/auth/auth.routes';
 import { adminCategoryDirtyGuard } from './features/admin/categories/guards/admin-category-dirty.guard';
+import { adminProductDirtyGuard } from './features/admin/products/guards/admin-product-dirty.guard';
 import { AdminLayoutComponent } from './features/admin/shell/admin-layout.component';
 import { environment } from '../environments/environment';
 
@@ -82,6 +83,7 @@ const coreRoutes: Routes = [
       {
         path: 'products/create',
         loadComponent: () => import('./features/admin/products/pages/admin-product-editor-page.component').then(m => m.AdminProductEditorPageComponent),
+        canDeactivate: [adminProductDirtyGuard],
         data: {
           titleKey: 'adminShell.pages.productCreate.title',
           descriptionKey: 'adminShell.pages.productCreate.description',
@@ -91,6 +93,7 @@ const coreRoutes: Routes = [
       {
         path: 'products/:id/edit',
         loadComponent: () => import('./features/admin/products/pages/admin-product-editor-page.component').then(m => m.AdminProductEditorPageComponent),
+        canDeactivate: [adminProductDirtyGuard],
         data: {
           titleKey: 'adminShell.pages.productEdit.title',
           descriptionKey: 'adminShell.pages.productEdit.description',
@@ -100,6 +103,7 @@ const coreRoutes: Routes = [
       {
         path: 'products/:id/duplicate',
         loadComponent: () => import('./features/admin/products/pages/admin-product-editor-page.component').then(m => m.AdminProductEditorPageComponent),
+        canDeactivate: [adminProductDirtyGuard],
         data: {
           titleKey: 'adminShell.pages.productDuplicate.title',
           descriptionKey: 'adminShell.pages.productDuplicate.description',