build: add standard WCS core module

ruoyi-wcs/src/main/java/com/ruoyi/wcs/WcsModule.java

@@ -0,0 +1,9 @@
+package com.ruoyi.wcs;
+
+/**
+ * Stable marker for the standard WCS core module.
+ */
+public final class WcsModule {
+    private WcsModule() {
+    }
+}

ruoyi-wcs/src/test/java/com/ruoyi/wcs/architecture/WcsModuleArchitectureTest.java

@@ -0,0 +1,25 @@
+package com.ruoyi.wcs.architecture;
+
+import com.tngtech.archunit.core.importer.ClassFileImporter;
+import org.junit.jupiter.api.Test;
+
+import static com.tngtech.archunit.lang.syntax.ArchRuleDefinition.noClasses;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class WcsModuleArchitectureTest {
+
+    @Test
+    void exposesAStableModuleMarker() throws Exception {
+        assertEquals("com.ruoyi.wcs.WcsModule",
+                Class.forName("com.ruoyi.wcs.WcsModule").getName());
+    }
+
+    @Test
+    void coreDoesNotDependOnProjectOrPlcPackages() {
+        noClasses().that().resideInAPackage("com.ruoyi.wcs..")
+                .should().dependOnClassesThat()
+                .resideInAnyPackage("com.ruoyi.schedule..", "com.ruoyi.api..",
+                        "HslCommunication..", "org.apache.plc4x..")
+                .check(new ClassFileImporter().importPackages("com.ruoyi.wcs"));
+    }
+}