test: 建立 phpunit 測試基建並移植 25 個 HivePress 測試

AddOn 先前 tests=0。新增：
- composer.json（dev 依賴 + phpunit/phpcs script）
- phpunit.xml（failOnWarning=true）
- tests/bootstrap.php：直接 require 核心 plugin 的 unit bootstrap，避免複製
  ~700 行 WP stub，再載入本 AddOn 的類別；補 trait wrapper 與自動 WPDO_ alias
  （includes/back-compat-aliases.php 掛在 plugins_loaded:7，PHPUnit 下不會跑）
- tests/unit/ 25 個測試 + WpdbMockTrait（自 A 移植）

生產碼一併修對外契約：interface-tmdo-hp-adapter.php 改為先宣告空的
WPDO_HivePress_Adapter、再讓 TMDO_HivePress_Adapter extends 它（PHP 無法
class_alias 介面，只有繼承能讓 instanceof WPDO_HivePress_Adapter 對
implements TMDO_ 名稱的 adapter 成立）。與核心 interface-entity-adapter.php
同一模式。這也讓第三方自訂 adapter 用舊介面名仍可通過核心檢查。

145 tests / 357 assertions GREEN

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TbG1keQQ7XBa7qMQY16KCY

tests/unit/AdminHivePressTest.php

@@ -0,0 +1,57 @@
+<?php
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Tests for WPDO_Admin_HivePress.
+ *
+ * @covers WPDO_Admin_HivePress
+ */
+class AdminHivePressTest extends TestCase {
+
+	protected function setUp(): void {
+		WPDO_HivePress_Bootstrap::reset_for_tests();
+		WPDO_HivePress_Detector::reset_for_tests();
+		WPDO_HivePress_Conflict_Guard::reset_for_tests();
+	}
+
+	public function test_render_outputs_addon_catalog(): void {
+		$out = self::capture( static function () {
+			WPDO_Admin_HivePress::render();
+		} );
+
+		$this->assertStringContainsString( 'HivePress', $out );
+		$this->assertStringContainsString( 'hivepress', $out );
+		$this->assertStringContainsString( 'wp wpdo hivepress', $out );
+	}
+
+	public function test_render_shows_clean_when_no_conflicts(): void {
+		$out = self::capture( static function () {
+			WPDO_Admin_HivePress::render();
+		} );
+
+		$this->assertStringContainsString( 'Conflict guard', $out );
+		$this->assertStringContainsString( 'notice-success', $out );
+	}
+
+	/**
+	 * Capture echo output of a callable in a single buffer level.
+	 *
+	 * Avoids PHPUnit's "did not close output buffers" warning by using
+	 * the level-checked open/close pattern.
+	 */
+	private static function capture( callable $callable ): string {
+		$start_level = ob_get_level();
+		ob_start();
+		try {
+			$callable();
+		} finally {
+			$out = '';
+			while ( ob_get_level() > $start_level ) {
+				$out = (string) ob_get_clean() . $out;
+			}
+		}
+		return $out;
+	}
+}