feat(06-admin-base): Admin\ base infrastructure — Form Edit System + Support layer (Phase 6)

Phase 6 zamknięta po 2 planach. Pełny fundament dla Phase 7-13 (migracja
17 admin controllers do Admin\ namespace).

06-01 (Forms infrastructure):
- Admin\ViewModels\Forms\* — 5 ViewModeli (687 L)
- Admin\Validation\FormValidator (196 L)
- composer.json: php >=7.4, PSR-4 paths cross-platform safe
  (Admin\ → autoload/admin/, Frontend\ → autoload/front/)

06-02 (Support layer):
- Admin\Support\TableListRequestFactory (99 L) — parser list z $_GET
- Admin\Support\Forms\FormRequestHandler (159 L) — POST + CSRF + walidacja + persist
- Admin\Support\Forms\FormFieldRenderer (494 L) — renderer HTML pól

Decyzje:
- Brak BaseController — Phase 7+ kontrolery jako POJOs z DI (jak shopPRO)
- PSR-4 filename fix: TableListRequestFactory.php (bez shopPRO 'class.' prefix)
- PascalCase namespace (Admin\Support) na lowercase folder admin/
  ze względu na Windows fs case-insensitivity vs legacy admin/controls/

Pliki: 8 nowych klas, 1635 L kodu PHP 7.4-kompatybilnego, zero regresji.
Smoke test: walidacja e-maila zwraca PL komunikat, factory parsuje
?page=&per_page=&sort=&filter=, Domain/Shared nadal ładują się.

PHPUnit: 37/37 OK.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/PROJECT_STRUCTURE.md

@@ -80,7 +80,30 @@ autoload/Domain/
 └── User/UserRepository.php                     ← \Domain\User\UserRepository             ✓
 ```
 
-Następne: `Admin\` namespace (Fazy 6–13), `Frontend\` namespace (Fazy 14–16).
+### Faza 6 ✓ — Admin\ Base Infrastructure (`autoload/admin/{ViewModels,Validation,Support}/`)
+
+Skopiowane z shopPRO i przeniesione pod `Admin\` (PSR-4 PascalCase namespace, lowercase folder ze względu na case-insensitive Windows fs):
+
+```
+autoload/admin/                    ← namespace Admin\* (nowe) + admin\* (legacy)
+├── ViewModels/Forms/              ← Admin\ViewModels\Forms
+│   ├── FormEditViewModel.php
+│   ├── FormField.php
+│   ├── FormFieldType.php
+│   ├── FormTab.php
+│   └── FormAction.php
+├── Validation/
+│   └── FormValidator.php          ← Admin\Validation\FormValidator
+└── Support/
+    ├── TableListRequestFactory.php  ← Admin\Support — parser list (page/per_page/sort/filter)
+    └── Forms/
+        ├── FormRequestHandler.php   ← Admin\Support\Forms — POST + CSRF + validate + persist
+        └── FormFieldRenderer.php    ← Admin\Support\Forms — HTML renderer (deleguje Shared\Html\Html)
+```
+
+Decyzja: **brak BaseController** — Phase 7+ kontrolery będą POJOs z DI w konstruktorze (jak shopPRO `BannerController(BannerRepository, LanguagesRepository)`).
+
+Następne: `Admin\` controllers (Fazy 7–13), `Frontend\` namespace (Fazy 14–16).
 ---
 
 ## Katalogi