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/configs/.env.testing.template

@@ -0,0 +1,28 @@
+# Môi trường cách ly cho Unit & Feature Tests Laravel
+APP_NAME="Laravel Test"
+APP_ENV=testing
+APP_KEY=base64:FakeKeyForTestingPurposesOnly1234567890=
+APP_DEBUG=true
+APP_URL=http://localhost
+
+LOG_CHANNEL=null
+LOG_LEVEL=emergency
+
+# Database SQLite in-memory siêu tốc
+DB_CONNECTION=sqlite
+DB_DATABASE=:memory:
+
+# Tối ưu mã hóa mật khẩu khi chạy test
+BCRYPT_ROUNDS=4
+
+# Chặn gửi mail / queue / cache / session thật
+CACHE_STORE=array
+CACHE_DRIVER=array
+QUEUE_CONNECTION=sync
+SESSION_DRIVER=array
+MAIL_MAILER=array
+
+# Tắt các monitoring package
+TELESCOPE_ENABLED=false
+PULSE_ENABLED=false
+HORIZON_PREFIX=testing-horizon

templates/configs/Pest.template.php

@@ -0,0 +1,45 @@
+<?php
+
+/*
+|--------------------------------------------------------------------------
+| Test Case Configuration
+|--------------------------------------------------------------------------
+|
+| Định cấu hình TestCase mặc định cho Unit và Feature tests trong Pest PHP.
+|
+*/
+
+uses(
+    Tests\TestCase::class,
+    // Illuminate\Foundation\Testing\RefreshDatabase::class, // Chỉ bật trong Feature Test
+)->in('Feature');
+
+uses(
+    Tests\TestCase::class,
+)->in('Unit');
+
+/*
+|--------------------------------------------------------------------------
+| Expectations Custom Helpers
+|--------------------------------------------------------------------------
+|
+| Tạo các custom expectation mở rộng của Pest nếu cần.
+|
+*/
+
+expect()->extend('toBeValidEmail', function () {
+    return $this->toBeString()->toMatch('/^.+@.+\..+$/');
+});
+
+/*
+|--------------------------------------------------------------------------
+| Functions Helpers
+|--------------------------------------------------------------------------
+|
+| Hàm global hỗ trợ khởi tạo dữ liệu giả lập cho test.
+|
+*/
+
+// function asUser($user = null) {
+//     return test()->actingAs($user ?? User::factory()->create());
+// }

templates/configs/phpunit.xml.dist.template

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         cacheDirectory=".phpunit.cache"
+         executionOrder="depends,defects"
+         requireCoverageMetadata="false"
+         beStrictAboutCoverageMetadata="false"
+         beStrictAboutOutputDuringTests="true"
+         failOnRisky="true"
+         failOnWarning="true">
+    <testsuites>
+        <testsuite name="Unit">
+            <directory suffix="Test.php">./tests/Unit</directory>
+        </testsuite>
+        <testsuite name="Feature">
+            <directory suffix="Test.php">./tests/Feature</directory>
+        </testsuite>
+    </testsuites>
+    <source restrictDeprecations="true" restrictNotices="true" restrictWarnings="true">
+        <include>
+            <directory>./app</directory>
+        </include>
+    </source>
+    <php>
+        <env name="APP_ENV" value="testing"/>
+        <env name="APP_MAINTENANCE_DRIVER" value="file"/>
+        <env name="BCRYPT_ROUNDS" value="4"/>
+        <env name="CACHE_STORE" value="array"/>
+        <env name="CACHE_DRIVER" value="array"/>
+        <env name="DB_CONNECTION" value="sqlite"/>
+        <env name="DB_DATABASE" value=":memory:"/>
+        <env name="MAIL_MAILER" value="array"/>
+        <env name="PULSE_ENABLED" value="false"/>
+        <env name="QUEUE_CONNECTION" value="sync"/>
+        <env name="SESSION_DRIVER" value="array"/>
+        <env name="TELESCOPE_ENABLED" value="false"/>
+    </php>
+</phpunit>