Thymeleaf 호환성 테스트 추가:

- Mvc/Form/Security/Expression 관련 템플릿 및 테스트 구현
- 의존성 검증 및 업그레이드 스크립트 추가 (Thymeleaf 3.1.5 적용)

gradle/thymeleaf-verification.init.gradle

@@ -0,0 +1,21 @@
+// ./gradlew -I gradle/thymeleaf-verification.init.gradle :thymeleafCompatibilityDependencies
+// Read-only dependency resolution; does not override versions or the normal build.
+gradle.projectsEvaluated {
+    def portal = gradle.rootProject
+    portal.tasks.register('thymeleafCompatibilityDependencies') {
+        doLast {
+            def output = new File(portal.buildDir, 'reports/thymeleaf-compatibility')
+            output.mkdirs()
+            ['runtimeClasspath', 'testRuntimeClasspath'].each { name ->
+                def artifacts = portal.configurations.getByName(name).resolvedConfiguration.resolvedArtifacts
+                def rows = artifacts.findAll {
+                    it.id.componentIdentifier instanceof org.gradle.api.artifacts.component.ModuleComponentIdentifier
+                }.collect {
+                    "${it.moduleVersion.id.group}:${it.name}\t${it.moduleVersion.id.version}\t${it.file.name}"
+                }.sort()
+                new File(output, "${name}.tsv").text = rows.join('\n') + '\n'
+            }
+            println "Dependency evidence: ${output}"
+        }
+    }
+}