fix: clarify upload errors and raise upload limits

server.mjs

@@ -148,6 +148,7 @@ import {
 } from './mindspace-chat-docx-package.mjs';
 import { scanContent } from './mindspace-content-scan.mjs';
 import { renderImageAssetViewerHtml, wantsInlineImageViewer } from './mindspace-asset-preview.mjs';
+import { DEFAULT_IMAGE_UPLOAD_MAX_BYTES } from './user-image-normalize.mjs';
 import { createRechargeService } from './billing-recharge.mjs';
 import { createSubscriptionService, createPlanCatalogService, ensurePlanCatalogSchema, PLAN_CATALOG } from './billing-subscription.mjs';
 import {
@@ -268,7 +269,7 @@ const jsonUnlessMultipart = (req, res, next) => {
 };
 const rawUploadBody = express.raw({
   type: 'application/octet-stream',
-  limit: mindSpaceServerRuntime.maxFileBytes,
+  limit: Math.max(mindSpaceServerRuntime.maxFileBytes, DEFAULT_IMAGE_UPLOAD_MAX_BYTES),
 });
 const wikiAuth = createWikiAuth(path.join(resolveMindSpacePublishRoot(__dirname), 'wiki-db'));
 
@@ -2188,6 +2189,28 @@ function mindSpaceError(res, req, error) {
   return sendError(res, req, status, code, message, error?.details);
 }
 
+function isRequestBodyTooLarge(error) {
+  return (
+    error?.type === 'entity.too.large' ||
+    error?.status === 413 ||
+    error?.statusCode === 413
+  );
+}
+
+function apiRequestBodyError(error, req, res, next) {
+  if (!isRequestBodyTooLarge(error)) return next(error);
+  const isMindSpaceUpload = req.path.startsWith('/mindspace/v1/uploads/');
+  return sendError(
+    res,
+    req,
+    413,
+    isMindSpaceUpload ? 'file_too_large' : 'request_body_too_large',
+    isMindSpaceUpload
+      ? '上传文件超过单文件大小限制，请压缩后重试'
+      : '请求内容过大，请缩小后重试',
+  );
+}
+
 function ensureMindSpaceEnabled(res, req, { upload = false, agent = false } = {}) {
   try {
     assertMindSpaceRoute(msFlags, upload ? 'upload' : agent ? 'agent' : undefined);
@@ -4573,6 +4596,8 @@ api.get('/sessions/:sessionId/events', async (req, res, next) => {
   });
 });
 
+api.use(apiRequestBodyError);
+
 api.use(async (req, res, next) => {
   await userAuthReady;
   if (!userAuth || !tkmindProxy) return next();