feat: 将工作流与 FAQ 上传上限扩至 20MB

- 同步管理端、用户中心与后端工作流文件校验

- 扩展 FAQ 普通及分享上传限制并补充边界测试

easyflow-modules/easyflow-module-ai/src/test/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolverTest.java

@@ -8,6 +8,7 @@ import org.junit.Test;
 import tech.easyflow.ai.entity.Workflow;
 import tech.easyflow.ai.node.SearchDatasetNodeParser;
 import tech.easyflow.ai.node.WorkflowNodeParser;
+import tech.easyflow.common.web.exceptions.BusinessException;
 
 import java.lang.reflect.Field;
 import java.math.BigInteger;
@@ -178,6 +179,40 @@ public class WorkflowRunningParameterResolverTest {
         Assert.assertEquals(2, ((List<?>) attachments).size());
     }
 
+    /**
+     * 文件参数应允许 20MB 边界值，并拒绝超过边界的文件。
+     *
+     * @throws Exception 反射注入失败
+     */
+    @Test
+    public void testNormalizeRuntimeVariablesShouldEnforceTwentyMbSingleFileLimit() throws Exception {
+        WorkflowRunningParameterResolver resolver = newResolver();
+        Map<String, Object> variables = new LinkedHashMap<>();
+        variables.put("attachments", fileValue(
+                "accepted.pdf",
+                "/files/accepted.pdf",
+                20L * 1024L * 1024L
+        ));
+
+        Map<String, Object> normalized = resolver.normalizeRuntimeVariables(
+                workflowContentWithStartParameters(),
+                variables
+        );
+        Assert.assertEquals(1, ((List<?>) normalized.get("attachments")).size());
+
+        variables.put("attachments", fileValue(
+                "oversized.pdf",
+                "/files/oversized.pdf",
+                20L * 1024L * 1024L + 1L
+        ));
+        try {
+            resolver.normalizeRuntimeVariables(workflowContentWithStartParameters(), variables);
+            Assert.fail("expected BusinessException");
+        } catch (BusinessException exception) {
+            Assert.assertEquals("文件参数 attachments 中单个文件不能超过 20MB", exception.getMessage());
+        }
+    }
+
     private static WorkflowRunningParameterResolver newResolver() throws Exception {
         WorkflowRunningParameterResolver resolver = new WorkflowRunningParameterResolver();
         ChainParser parser = ChainParser.builder()

easyflow-modules/easyflow-module-ai/src/test/java/tech/easyflow/ai/node/DocNodeFileContentExtractorTest.java

@@ -263,6 +263,38 @@ public class DocNodeFileContentExtractorTest {
         }
     }
 
+    /**
+     * 验证文档节点允许 20MB 边界值，并拒绝超过边界的文件。
+     */
+    @Test
+    public void shouldEnforceTwentyMbSingleFileLimit() {
+        DocNodeFileContentExtractor extractor = new DocNodeFileContentExtractor(
+            new RecordingDocumentParseBridgeService(),
+            new FakeFileStorageService(),
+            new FakeReaderManager("plain text")
+        );
+        Map<String, Object> accepted = buildFileValue(
+            "accepted.pdf",
+            "/files/accepted.pdf",
+            "application/pdf"
+        );
+        accepted.put("size", 20L * 1024L * 1024L);
+        Assert.assertEquals(1, extractor.toDocumentSourceRefs(accepted).size());
+
+        Map<String, Object> oversized = buildFileValue(
+            "oversized.pdf",
+            "/files/oversized.pdf",
+            "application/pdf"
+        );
+        oversized.put("size", 20L * 1024L * 1024L + 1L);
+        try {
+            extractor.toDocumentSourceRefs(oversized);
+            Assert.fail("expected BusinessException");
+        } catch (BusinessException exception) {
+            Assert.assertEquals("单个文件不能超过 20MB: oversized.pdf", exception.getMessage());
+        }
+    }
+
     private Map<String, Object> buildFileValue(String fileName, String filePath, String contentType) {
         Map<String, Object> value = new HashMap<String, Object>();
         value.put("fileName", fileName);