feat: chat uploads, vision turn isolation, and MindSpace agent improvements

Add chat file/image upload UX, attachment proxying, vision thumbnails, and per-turn image scoping so agents only use the current upload. Extend MindSpace asset context, billing token state, OA/scenario verify scripts, and related runtime config.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/MessageList.tsx

@@ -1,7 +1,7 @@
 import { useRef, useState } from 'react';
 import { useUserAvatar } from '../hooks/useUserAvatar';
 import type { Message } from '../types';
-import { getDisplayText, getImageUrls, getRenderableImageUrls, getThinking, shouldShowChatMessage } from '../utils/message';
+import { getDisplayText, getFileAttachments, getImageUrls, getRenderableImageUrls, getThinking, shouldShowChatMessage } from '../utils/message';
 import { getMessageSaveActions } from '../utils/messageSave';
 import { renderMarkdown } from '../utils/markdown';
 import { filterText } from '../utils/wordFilter';
@@ -314,6 +314,7 @@ function MessageRow({
   const thinking = getThinking(message);
   const isUser = message.role === 'user';
   const imageUrls = getImageUrls(message);
+  const fileAttachments = getFileAttachments(message);
   const renderableImageUrls = getRenderableImageUrls(message);
   const copyText = [thinking ? `【思考】\n${thinking}` : '', text].filter(Boolean).join('\n\n');
 
@@ -421,6 +422,21 @@ function MessageRow({
                   ))}
                 </div>
               )}
+              {fileAttachments.length > 0 && (
+                <div className="msg-file-attachments">
+                  {fileAttachments.map((file, index) => (
+                    <a
+                      key={`${file.downloadUrl}-${index}`}
+                      href={file.downloadUrl}
+                      target="_blank"
+                      rel="noreferrer"
+                      className="msg-file-attachment-link"
+                    >
+                      {file.filename}
+                    </a>
+                  ))}
+                </div>
+              )}
               {text && (
                 <div
                   className="bubble-text"