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/phpunit.xml.dist.template

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    colors="true"
+    processIsolation="false"
+    stopOnFailure="false"
+    bootstrap="tests/bootstrap.php"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.2/phpunit.xsd"
+    cacheDirectory=".phpunit.cache">
+    <php>
+        <ini name="memory_limit" value="-1"/>
+        <ini name="apc.enable_cli" value="1"/>
+        <env name="FIXTURE_SCHEMA_METADATA" value="tests/schema.php"/>
+    </php>
+
+    <!-- Add any additional test suites you want to run here -->
+    <testsuites>
+        <testsuite name="app">
+            <directory>tests/TestCase/</directory>
+        </testsuite>
+    </testsuites>
+
+    <!-- Setup a listener for fixtures -->
+    <extensions>
+        <bootstrap class="Cake\TestSuite\Fixture\Extension\PHPUnitExtension"/>
+    </extensions>
+
+    <source>
+        <include>
+            <directory suffix=".php">src/</directory>
+            <directory suffix=".php">plugins/*/src/</directory>
+        </include>
+        <exclude>
+            <file>src/Console/Installer.php</file>
+        </exclude>
+    </source>
+</phpunit>