ci: 加入 test workflow（lint + unit）

unit job 會一併 checkout 核心 plugin — 本 AddOn 的測試 bootstrap 直接
require 核心的 tests/bootstrap.php。

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

.gitea/workflows/test.yml

@@ -0,0 +1,46 @@
+name: Tests
+
+on:
+  push:
+    branches: [ main, master, develop ]
+  pull_request:
+    branches: [ main, master, develop ]
+
+jobs:
+  lint:
+    name: PHP Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check PHP syntax
+        run: |
+          find . -name "*.php" ! -path "./vendor/*" ! -path "./tests/*" -print0 | xargs -0 -n1 php -l
+          echo "PHP syntax OK"
+
+  unit:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    # The suite boots off the core plugin's test bootstrap, so the core must be
+    # checked out next to this AddOn under wp-content/plugins/.
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: 2meet-data-optimizer-hivepress-addon
+
+      - name: Checkout core plugin
+        uses: actions/checkout@v4
+        with:
+          repository: wpdev/2meet-data-optimizer
+          path: 2meet-data-optimizer
+
+      - name: Install dependencies
+        working-directory: 2meet-data-optimizer-hivepress-addon
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Install core dev dependencies (test bootstrap needs them)
+        working-directory: 2meet-data-optimizer
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Run unit tests
+        working-directory: 2meet-data-optimizer-hivepress-addon
+        run: php vendor/bin/phpunit --configuration phpunit.xml --testdox