Enhance security by preventing the creation of default admin credentials in chat-users.json. Update chat.js to ensure command output does not pollute conversation history, and add chat-users.json to .gitignore to prevent tracking of sensitive user data.

client/src/stores/chat.js

@@ -293,23 +293,11 @@ export const useChatStore = defineStore('chat', () => {
         break;
       case 'commandResult': {
         const lines = Array.isArray(data.lines) ? data.lines : [];
-        if (!currentConversation.value) {
-          errorMessage.value = lines.join(' | ');
-          setTimeout(() => {
-            errorMessage.value = null;
-          }, 5000);
-          break;
-        }
-        const timestamp = new Date().toISOString();
-        for (const line of lines) {
-          messages.value.push({
-            from: 'System',
-            message: String(line),
-            timestamp,
-            self: false,
-            isImage: false
-          });
-        }
+        // Command output is global and must not pollute per-conversation history.
+        errorMessage.value = lines.join(' | ');
+        setTimeout(() => {
+          errorMessage.value = null;
+        }, 5000);
         break;
       }
       case 'unreadChats':