test: 添加全面的单元测试和集成测试

- 添加 common 模块单元测试 (ObjectHelper, SnowflakeHelper)
- 添加 database 模块集成测试 (SimpleServiceSupport, @SoftDelete)
- 添加 Controller REST API 契约测试
- 配置 H2 数据库和 p6spy 用于测试
- 更新 openspec 配置，添加并行任务和提问工具规则

spring-boot-service-template-database/pom.xml

@@ -43,6 +43,31 @@
       <groupId>org.mapstruct</groupId>
       <artifactId>mapstruct</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-test</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-data-jpa-test</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-webmvc-test</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.h2database</groupId>
+      <artifactId>h2</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.github.gavlyukovskiy</groupId>
+      <artifactId>p6spy-spring-boot-starter</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>