style: 项目重构

1.项目改名为kilostar（千星）
2.后端部分进行大规模重构
3.node功能进行大规模重新设计

frontend/src/components/Chat/ChatPanel.tsx

@@ -136,7 +136,7 @@ export function ChatPanel({ chatSessions, setChatSessions, activeSessionId, setA
     return (
       <div className="flex-1 flex flex-col bg-white overflow-hidden items-center justify-center">
         <Activity size={48} className="text-slate-300 mb-4" />
-        <h2 className="text-xl font-semibold text-slate-600">Pretor Assistant</h2>
+        <h2 className="text-xl font-semibold text-slate-600">kilostar Assistant</h2>
         <p className="text-slate-400 mt-2">Select a chat history or create a new one to start.</p>
         <button
           onClick={() => {
@@ -147,7 +147,7 @@ export function ChatPanel({ chatSessions, setChatSessions, activeSessionId, setA
                 {
                   id: Date.now().toString(),
                   role: 'assistant',
-                  content: 'Hello! I am Pretor Assistant. How can I help you today?',
+                  content: 'Hello! I am kilostar Assistant. How can I help you today?',
                   timestamp: Date.now(),
                 },
               ],
@@ -251,7 +251,7 @@ export function ChatPanel({ chatSessions, setChatSessions, activeSessionId, setA
             value={input}
             onChange={(e) => setInput(e.target.value)}
             onKeyDown={(e) => e.key === 'Enter' && handleSendMessage()}
-            placeholder="Ask Pretor to do something..."
+            placeholder="Ask kilostar to do something..."
             className="w-full bg-slate-50 border border-slate-200 text-sm rounded-2xl pl-12 pr-12 py-3.5 focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-400 transition-all"
           />
           <button