feat(catalog): implement sprint 10 advanced search experience

Sprint-10-Advanced-Search-Report.md

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+# Sprint 10 - Advanced Search & Catalog Report
+
+## 1. Architecture
+- Existing platform architecture was preserved.
+- No authentication flow changes.
+- No payment flow changes.
+- No bootstrap loading flow changes.
+- Widget engine and section engine were not modified.
+- ProductFacade was only extended (no contract removals or breaking changes).
+
+### Data Flow
+- Catalog UI calls ProductFacade only.
+- ProductFacade extensions for sprint 10:
+  - search(criteria)
+  - filter(criteria)
+  - sort(criteria)
+  - loadCatalog(criteria)
+- No HttpClient usage in feature layer.
+
+## 2. New Reusable Components
+### Search Module
+- CatalogSearchBoxComponent
+  - keyword search
+  - instant suggestions (frontend-prepared, backend-ready)
+  - recent searches
+  - search history
+  - loading and no-results hint
+
+### Filters Module
+- CatalogFiltersPanelComponent
+  - dynamic filter rendering from filter definitions
+  - supports multi-select, range, toggle filter types
+
+### Sorting Module
+- CatalogSortingControlComponent
+  - configurable sort options
+
+### Layout Module
+- CatalogLayoutSwitcherComponent
+  - grid
+  - large grid
+  - compact grid
+  - list
+
+### Search Results Module
+- CatalogSearchResultsComponent
+  - loading skeletons
+  - summary
+  - pagination
+  - empty state
+
+### Product Card Enhancements
+- Added placeholders (no business logic):
+  - favorite
+  - compare
+  - quick view
+- Added stock badge and configurable discount/rating/availability visibility.
+
+## 3. Domain Models
+Added reusable catalog/search models:
+- SearchCriteria
+- FilterDefinition
+- FilterOption
+- SortDefinition
+- CatalogView
+- SearchResult
+
+File:
+- src/app/core/products/models/catalog-experience.model.ts
+
+## 4. Bootstrap Additions
+Added catalog feature configuration (config only, no catalog data):
+- layout
+- navigationMode
+- defaultSort
+- availableSorts
+- enabledFilters
+- showBreadcrumbs
+- showCategoryBanner
+- showSubcategoryChips
+- showRatings
+- showDiscounts
+- showAvailability
+- suggestionsEnabled
+- searchHistoryEnabled
+
+Files:
+- src/app/shared/models/config/catalog-config.model.ts
+- src/app/shared/models/config/bootstrap-config.model.ts
+- src/assets/mock/bootstrap/bootstrap.json
+
+## 5. Backend Expectations
+Documented current and future-ready expectations:
+- Current:
+  - GET /searchitems
+  - GET /category/{id}
+- Future-ready:
+  - GET /search/suggestions?q={term}
+  - GET /catalog/filters?category={id}&q={term}
+
+## 6. Validation Results
+### Build
+- npm run build: PASS
+
+### Architecture
+- npm run arch:check:boundaries: PASS
+- npm run arch:check:cycles: PASS
+
+### Layering checks
+- HttpClient in feature layer: none found
+- DTO leaks in feature layer: none found (search matched addToCart text only, not DTO usage)
+
+### Compatibility
+- Widget compatibility preserved
+- Section engine compatibility preserved
+
+## 7. Documentation Updated
+- docs/platform/00-bootstrap-example.md
+- docs/platform/02-bootstrap-json-spec.md
+- docs/platform/06-api-contracts.md
+- docs/platform/08-catalog-domain.md
+- docs/platform/13-backend-requirements.md
+- docs/backend-platform/business-apis.md
+
+## 8. Future Extension Points
+- Backend-driven suggestions endpoint integration.
+- Backend-driven dynamic filter metadata (option counts/ranges/facets).
+- Navigation mode implementations:
+  - left category navigation
+  - mega category layout
+  - top category carousel
+- URL-state sync for all search/filter/sort/layout inputs.
+- Dedicated saved searches / personalized search suggestions.