fix: 将工作流文档解析上限统一为 100MiB

- 前后端统一单文件与总大小限制为 100MiB

- 按实际读取字节数拦截超限文档并记录大小差异

- 补充存储、远程流与边界场景测试

easyflow-ui-usercenter/app/src/views/ai/workflow/components/workflowFileValue.ts

@@ -21,8 +21,8 @@ export interface WorkflowResourceLike {
 
 export const WORKFLOW_FILE_LIMITS = {
   maxCount: 10,
-  maxSingleSize: 20 * 1024 * 1024,
-  maxTotalSize: 50 * 1024 * 1024,
+  maxSingleSize: 100 * 1024 * 1024,
+  maxTotalSize: 100 * 1024 * 1024,
 } as const;
 
 /**