调整product服务项目结构，商品规格列表接口

product/product-rpc-api/pom.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>system</artifactId>
+        <groupId>cn.iocoder.mall</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>product-rpc-api</artifactId>
+
+    <dependencies>
+        <!-- Mall 相关 -->
+        <dependency>
+            <groupId>cn.iocoder.mall</groupId>
+            <artifactId>product-biz-api</artifactId>
+            <version>1.0-SNAPSHOT</version>
+        </dependency>
+
+        <!-- 工具类相关 -->
+        <dependency>
+            <groupId>javax.validation</groupId>
+            <artifactId>validation-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+        </dependency>
+
+    </dependencies>
+
+</project>

product/product-rpc-api/src/main/java/cn/iocoder/mall/product/rpc/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * 提供 system 服务的 RPC 接口的定义，提供内部调用
+ */
+package cn.iocoder.mall.product.rpc;