feat(apitest): 新增 API 测试环境与安全配置

- 新增 apitest 专用 MySQL 配置与 Docker 编排（docker/apitest-mysql.yml、docker/apitest-mysql/）

- 增加 ApiTestSecurityConfig / ApiTestSecurityProperties 与 ApiTestAuthenticationFilter

- 新增 application-apitest.yml 与相关测试目录（play-admin/src/test/java/com/starry/admin/api/）

- 调整根 pom 与 play-admin/pom 依赖，优化 SpringSecurityConfig 以兼容 apitest

docker/apitest-mysql.yml

@@ -0,0 +1,27 @@
+version: "3.9"
+
+services:
+  mysql-apitest:
+    image: mysql:8.0.32
+    container_name: peipei-mysql-apitest
+    restart: unless-stopped
+    environment:
+      MYSQL_ROOT_PASSWORD: root
+      MYSQL_DATABASE: peipei_apitest
+      MYSQL_USER: apitest
+      MYSQL_PASSWORD: apitest
+    ports:
+      - "33306:3306"
+    volumes:
+      - ./apitest-mysql/init:/docker-entrypoint-initdb.d:ro
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "127.0.0.1", "-uroot", "-proot"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+    command:
+      - "--default-authentication-plugin=mysql_native_password"
+      - "--lower_case_table_names=1"
+      - "--explicit_defaults_for_timestamp=1"
+      - "--character-set-server=utf8mb4"
+      - "--collation-server=utf8mb4_unicode_ci"