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>

package.json

@@ -31,8 +31,6 @@
     "@angular/router": "21.1.5",
     "@angular/service-worker": "21.1.5",
     "@lucide/angular": "^1.25.0",
-    "primeicons": "^7.0.0",
-    "primeng": "^21.0.3",
     "rxjs": "~7.8.0",
     "tslib": "^2.8.0",
     "zone.js": "~0.16.0"
@@ -42,12 +40,12 @@
     "@angular/cli": "21.1.5",
     "@angular/compiler-cli": "21.1.5",
     "@types/jasmine": "~5.1.0",
+    "barry-cache": "^0.9.3",
     "jasmine-core": "~5.5.0",
     "karma": "~6.4.0",
     "karma-chrome-launcher": "~3.2.0",
     "karma-jasmine": "~5.1.0",
     "karma-jasmine-html-reporter": "~2.1.0",
-    "typescript": "~5.9.3",
-    "barry-cache": "^0.1.0"
+    "typescript": "~5.9.3"
   }
 }