fix: 完善工作流公共接口上传与错误契约

- 区分 HTTP 请求标识与内部上传标识，补齐 Redis 旧记录兼容和关联日志

- 保持归一化 MIME 一致，并隔离工作流鉴权错误契约对其他公共接口的影响

- 收口 Multipart 操作日志与对象存储故障分类，归档范围：S05

easyflow-modules/easyflow-module-log/src/test/java/tech/easyflow/log/reporter/ActionReportInterceptorTest.java

@@ -0,0 +1,76 @@
+package tech.easyflow.log.reporter;
+
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.Test;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.web.method.HandlerMethod;
+import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.multipart.MultipartHttpServletRequest;
+
+import java.util.Map;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * {@link ActionReportInterceptor} Multipart 日志安全测试。
+ */
+public class ActionReportInterceptorTest {
+
+    /**
+     * 验证 Multipart 日志只读取 Part 元数据，不读取原始请求体。
+     *
+     * @throws Exception 构造处理器或日志回调失败
+     */
+    @Test
+    public void multipartReportShouldNotReadRawRequestBody()
+            throws Exception {
+        ActionReportInterceptor interceptor =
+                new ActionReportInterceptor(
+                        new ActionLogReporterProperties());
+        MultipartHttpServletRequest request =
+                mock(MultipartHttpServletRequest.class);
+        HttpServletResponse response = mock(HttpServletResponse.class);
+        MultipartFile file = mock(MultipartFile.class);
+        LinkedMultiValueMap<String, MultipartFile> files =
+                new LinkedMultiValueMap<>();
+        files.add("files.document", file);
+        when(request.getMethod()).thenReturn("POST");
+        when(request.getRequestURI())
+                .thenReturn("/public-api/workflow/runAsync");
+        when(request.getContentType())
+                .thenReturn("multipart/form-data; boundary=test");
+        when(request.getParameterMap()).thenReturn(Map.of());
+        when(request.getMultiFileMap()).thenReturn(files);
+        when(file.getOriginalFilename())
+                .thenReturn("C:\\fakepath\\report.docx");
+        when(file.getContentType()).thenReturn("Other");
+        when(file.getSize()).thenReturn(128L);
+        HandlerMethod handler = new HandlerMethod(
+                new SampleController(),
+                SampleController.class.getDeclaredMethod("run"));
+
+        interceptor.preHandle(request, response, handler);
+        interceptor.afterCompletion(
+                request,
+                response,
+                handler,
+                null);
+
+        verify(request, never()).getInputStream();
+    }
+
+    /**
+     * 提供测试用处理方法。
+     */
+    private static final class SampleController {
+
+        /**
+         * 测试处理方法。
+         */
+        private void run() {
+        }
+    }
+}