fix: kb message truncate bug fix

frontend/src/components/ChatInterface.tsx

@@ -574,10 +574,17 @@ export function ChatInterface() {
               let cleanContent = m.content || "";
               // Remove injected system prompt instructions from user messages if present
               if (m.role === 'user') {
-                cleanContent = cleanContent.replace(/^\[System:.*?\]\n?/i, '');
-                // Handle cases where there might be a runtime context block for skills
-                cleanContent = cleanContent.replace(/\[Runtime Context[\s\S]*?(?=\[System:|$)/i, '');
-                cleanContent = cleanContent.replace(/\[System:.*?\]\n?/i, ''); // clean again in case it follows context
+                if (cleanContent.startsWith("[Runtime Context")) {
+                  const splitIndex = cleanContent.indexOf("\n\n");
+                  if (splitIndex !== -1) {
+                    cleanContent = cleanContent.substring(splitIndex + 2);
+                  } else {
+                    cleanContent = "";
+                  }
+                } else if (cleanContent.startsWith("[System:")) {
+                  // Fallback for older messages containing [System: ...] wrapper
+                  cleanContent = cleanContent.replace(/^\[System:[\s\S]*?\]\n*/i, '');
+                }
                 cleanContent = cleanContent.trim();
               }
               return {

frontend/src/i18n/locales/en.json

@@ -208,7 +208,7 @@
   "knowledgeDocumentDeleteFailed": "Failed to delete document",
   "noKnowledgeDocuments": "No documents in this knowledge base",
   "knowledgeDocumentUploadTitle": "Upload Documents to Knowledge Base",
-  "knowledgeDocumentUploadHint": "Supports txt, md, json, yaml, xml, html, csv, xls, xlsx. Max 5MB per file.",
+  "knowledgeDocumentUploadHint": "Supports Text/Markdown/Code, Office(Word/Excel/PPT) and PDF. Max 15MB per file.",
   "knowledgeDocumentUploadSelected": "{{count}} file(s) selected",
   "knowledgeDocumentUploadNone": "No files selected",
   "knowledgeDocumentUploadAction": "Upload and Add",

frontend/src/i18n/locales/zh.json

@@ -222,7 +222,7 @@
   "knowledgeDocumentDeleteFailed": "删除文档失败",
   "noKnowledgeDocuments": "当前知识库还没有文档",
   "knowledgeDocumentUploadTitle": "上传文档到知识库",
-  "knowledgeDocumentUploadHint": "支持 txt、md、json、yaml、xml、html、csv、xls、xlsx，单文件不超过 5MB。",
+  "knowledgeDocumentUploadHint": "支持 文本/Markdown/代码、Office (Word/Excel/PPT) 及 PDF 文件，单文件不超过 15MB。",
   "knowledgeDocumentUploadSelected": "已选择 {{count}} 个文件",
   "knowledgeDocumentUploadNone": "尚未选择文件",
   "knowledgeDocumentUploadAction": "上传并入库",

frontend/src/pages/KnowledgeBases.tsx

@@ -499,7 +499,8 @@ export function KnowledgeBases() {
           <div className="flex-1 overflow-y-auto p-6 space-y-6">
             {/* Upload Section */}
             <div className="rounded-lg border border-border p-4 bg-muted/30">
-              <div className="text-sm font-medium text-foreground mb-3">{t('knowledgeDocumentUploadTitle')}</div>
+              <div className="text-sm font-medium text-foreground mb-1">{t('knowledgeDocumentUploadTitle')}</div>
+              <div className="text-xs text-muted-foreground mb-3">{t('knowledgeDocumentUploadHint')}</div>
               <div className="flex items-center gap-3">
                 <Input
                   type="file"