feat: complete Smartgift AI Laravel unit testing toolkit

- Add 10 core testing guides (setup, AAA principles, PHPUnit/Pest, mocking, anti-patterns, PHP 8.4+, debugging, data factories, advanced edge cases)
- Add 13 component testing guides covering all Laravel layers
- Add standard templates for PHPUnit 10/11 and Pest v2/v3 including ArchitectureTest
- Add Docker smart test runner, dependency installer, and CI/CD templates (GitHub Actions, GitLab CI)
- Add 4 Claude Code skills (laravel-test-setup, laravel-unit-test with --all mode, laravel-test-review, laravel-mock-helper)
- Add single unified installer script (sg-install-unit-testing.sh) with global support, CLI runners, and 1-click updater (sg-test-update)
- Add comprehensive documentation (README.md, USAGE-GUIDE.md)

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

templates/pest/FormRequestTest.template.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+use {{TargetClassFullName}};
+use Illuminate\Support\Facades\Validator;
+
+describe('{{ClassName}}', function () {
+    it('authorizes request appropriately', function () {
+        $request = new {{ClassName}}();
+        expect($request->authorize())->toBeTrue();
+    });
+
+    it('passes validation with valid payload', function () {
+        $request = new {{ClassName}}();
+        $validator = Validator::make([
+            // Valid data here
+        ], $request->rules());
+
+        expect($validator->fails())->toBeFalse();
+    });
+
+    it('fails validation when required fields are missing', function () {
+        $request = new {{ClassName}}();
+        $validator = Validator::make([], $request->rules());
+
+        expect($validator->fails())->toBeTrue();
+    });
+});