ver. 0.294: Remove all 12 legacy autoload/shop/ classes (~2363 lines)

Complete Domain-Driven Architecture migration:
- Phase 1-4: Transport, ProductSet, Coupon, Shop, Search, Basket,
  ProductCustomField, Category, ProductAttribute, Promotion
- Phase 5: Order (~562 lines) + Product (~952 lines)
- ~20 Product methods migrated to ProductRepository
- Apilo sync migrated to OrderAdminService
- Production hotfixes: stale Redis cache (prices 0.00), unqualified
  Product:: refs in LayoutEngine, object->array template conversion
- AttributeRepository::getAttributeValueById() Redis cache added

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -36,7 +36,7 @@ composer test
 
 PHPUnit 9.6 via `phpunit.phar`. Bootstrap: `tests/bootstrap.php`. Config: `phpunit.xml`.
 
-Current suite: **610 tests, 1816 assertions**.
+Current suite: **610 tests, 1817 assertions**.
 
 ### Creating Updates
 See `docs/UPDATE_INSTRUCTIONS.md` for the full procedure. Updates are ZIP packages in `updates/0.XX/`. Never include `*.md` files, `updates/changelog.php`, or root `.htaccess` in update ZIPs.
@@ -59,7 +59,7 @@ shopPRO/
 │   │   ├── LayoutEngine.php    # Layout engine (\front\LayoutEngine)
 │   │   ├── Controllers/        # DI controllers (\front\Controllers\)
 │   │   └── Views/              # Static views (\front\Views\)
-│   └── shop/                   # Legacy shop classes (Product, Order, etc.)
+│   └── shop/                   # EMPTY — all legacy classes migrated to Domain\
 ├── admin/                      # Admin panel
 │   ├── templates/              # Admin view templates
 │   └── layout/                 # Admin CSS/JS/icons
@@ -93,7 +93,7 @@ Custom autoloader in each entry point (not Composer autoload at runtime). Tries
 - `\admin\Controllers\` → `autoload/admin/Controllers/` (lowercase a — existing directory)
 - `\Shared\` → `autoload/Shared/`
 - `\front\` → `autoload/front/`
-- `\shop\` → `autoload/shop/`
+- ~~`\shop\`~~ → `autoload/shop/` (EMPTY — all classes migrated to `\Domain\`)
 - Do NOT use `\Admin\` (uppercase A) — the server directory is `admin/` (lowercase)
 
 ### Domain-Driven Architecture (migration complete for admin + frontend)
@@ -187,6 +187,7 @@ Before starting implementation, review current state of docs (see AGENTS.md for
 - `docs/PROJECT_STRUCTURE.md` — detailed project structure and module status
 - `docs/REFACTORING_PLAN.md` — Domain migration plan and status
 - `docs/FRONTEND_REFACTORING_PLAN.md` — frontend migration plan (mostly complete)
+- `docs/LEGACY_SHOP_REFACTORING_PLAN.md` — plan usunięcia 12 legacy klas z `autoload/shop/` (UKOŃCZONY — wszystkie 12 klas usunięte)
 - `docs/DATABASE_STRUCTURE.md` — full database schema
 - `docs/TESTING.md` — test suite status and history
 - `docs/FORM_EDIT_SYSTEM.md` — form system architecture