Fix sourcepath configuration to preserve existing values

Modify JavaCompileConfigurator and KotlinCompileConfigurator to append
resource directories to the existing sourcepath instead of replacing it.
This ensures compatibility with projects that have custom sourcepath
configurations.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: nakamura-to

compile/src/main/groovy/org/seasar/doma/gradle/compile/KotlinCompileConfigurator.groovy

@@ -7,31 +7,35 @@ import org.gradle.api.tasks.SourceSet
  * Configures Kotlin/KAPT compilation tasks for Doma annotation processing.
  */
 class KotlinCompileConfigurator {
-    
+
     private static final String KOTLIN_KAPT_PLUGIN_ID = 'kotlin-kapt'
     private static final String KAPT_EXTENSION_NAME = 'kapt'
     private static final String SOURCE_PATH_OPTION = '--source-path'
     private static final String PARAMETERS_OPTION = '-parameters'
-    
+
     private final Project project
-    
+
     KotlinCompileConfigurator(Project project) {
         this.project = Objects.requireNonNull(project)
     }
-    
+
     void configure(SourceSet sourceSet) {
         project.plugins.withId(KOTLIN_KAPT_PLUGIN_ID) {
             configureKapt(sourceSet)
         }
     }
-    
+
     private void configureKapt(SourceSet sourceSet) {
         def kapt = project.extensions.getByName(KAPT_EXTENSION_NAME)
         def resourceDirs = sourceSet.resources.srcDirs
-        def sourcePath = resourceDirs.join(File.pathSeparator)
+        def newSourcepath = resourceDirs.join(File.pathSeparator)
+        def currentSourcepath = kapt.javacOptions[SOURCE_PATH_OPTION]
+        def sourcepath = currentSourcepath == null
+                ? newSourcepath
+                : currentSourcepath + File.pathSeparator + newSourcepath
 
         kapt.javacOptions {
-            option SOURCE_PATH_OPTION, sourcePath
+            option SOURCE_PATH_OPTION, sourcepath
             option PARAMETERS_OPTION, ''
         }
     }

compile/src/main/java/org/seasar/doma/gradle/compile/JavaCompileConfigurator.java

@@ -29,7 +29,11 @@ private void configureJavaCompile(SourceSet sourceSet, JavaCompile javaCompile)
         __ -> {
           var resourceDirs = sourceSet.getResources().getSrcDirs();
           var options = javaCompile.getOptions();
-          options.setSourcepath(project.files(resourceDirs));
+          var newSourcepath = project.files(resourceDirs);
+          var currentSourcepath = options.getSourcepath();
+          var sourcepath =
+              currentSourcepath == null ? newSourcepath : currentSourcepath.plus(newSourcepath);
+          options.setSourcepath(sourcepath);
           options.getCompilerArgs().add(PARAMETERS_COMPILER_ARG);
         });
   }