feat: add comprehensive unit testing support for CakePHP

- Add 4 CakePHP Claude Code skills: cakephp-unit-test, cakephp-test-setup, cakephp-test-review, cakephp-mock-helper
- Add 11 CakePHP PHPUnit component templates (Table, Entity, Controller, Service, Command, Component, Middleware, Mailer, Form, Behavior, Helper)
- Add CakePHP configs (phpunit.xml.dist, app_local.test.php for SQLite in-memory)
- Add comprehensive CakePHP documentation and component guides
- Update test-runner.sh and installer to auto-detect Laravel and CakePHP
- Add CakePHP CI/CD templates for GitHub Actions and GitLab CI
- Update system prompt, verification checklist, and README with dedicated guides

templates/cakephp/configs/app_local.test.php

@@ -0,0 +1,22 @@
+<?php
+/*
+ * Local test configuration for CakePHP
+ * Đảm bảo Datasources.test dùng SQLite In-memory (:memory:) an toàn, tốc độ cao.
+ */
+return [
+    'Datasources' => [
+        'test' => [
+            'className' => 'Cake\Database\Connection',
+            'driver' => 'Cake\Database\Driver\Sqlite',
+            'persistent' => false,
+            'timezone' => 'UTC',
+            'flags' => [],
+            'encoding' => 'utf8',
+            'database' => ':memory:',
+            'init' => [],
+            'cacheMetadata' => true,
+            'quoteIdentifiers' => false,
+            'log' => false,
+        ],
+    ],
+];