I have deploy code-server on my ubuntu server, and it can successfully compile, debug or run C++ code. But the problem is that the syntax highlight, commands, variable, properties... auto complete, publish diagnostics, and code action from C/C++ entension didn't work.

What I want

Here is the screenshots in my local laptop that show what i want.
the word "vector" is green

it suggests me that what i should type

when i make some mistake it will remind me

But these three things don't happen when I use code-server in my server

What I want is the code-server could act consistently with my local vscode.

What I've Tried

I have followed a lot of guidence on the Internet, and also try to ask GPT for help. But all failed. During trail I was aware of that the keypoint is "Intellisense" from "C/C++"

I have followed the guidence on https://code.visualstudio.com/docs/cpp/configure-intellisense. it teaches me to use ">C/C++: Select Intellisense Configuration", and it really work on my local vscode -- after click this
, it will show up
, which is consistent with the guidence.
But when I do this on my code-server, it falied to pop up the follow choices, it just do nothing after i click the ">C/C++: Select Intellisense Configuration".

If anything I've explained is unclear, please don't hesitate to ask me right away.
Thankyou for your help! =)

INFO

os info:

LSB Version: core-11.1.0ubuntu4-noarch:security-11.1.0ubuntu4-noarch
Distributor ID: Ubuntu
Description: Ubuntu 22.04.5 LTS
Release: 22.04
Codename: jammy

code-server version

4.105.1 811ec6c with Code 1.105.1

C/C++ extension:

I download this from https://github.com/microsoft/vscode-cpptools/releases/download/v1.29.0/cpptools-linux-x64.vsix

my json files on workpalce:

tasks.json
settings.json
launch.json
c_cpp_properties.json

extensions installed:

Supplementary

everytime when I reload the code-server, it shows this warning. I think it might be where the problem come from?