add missing routes forCN client & make third party login channel controllable

[TomyJan]

Description

reopen #2208

1. Add missing routes for CN client.
2. Make third party login channel controllable.
3. Improve the prompt of version mismatch.
4. Modify the response of the mdk config and combo config, from string concatenation to JSON objects.
5. Fix errors and missing values in some HTTP JSON response.

Issues fixed by this PR

Type of changes

• Bug fix
• New feature
• Enhancement
• Documentation

Checklist:

• My code follows the style guidelines of this project
• My pull request is unique and no other pull requests have been opened for these changes
• I have read the Contributing note and Code of conduct
• I am responsible for any copyright issues with my code if it occurs in the future.

[KingRainbow44]

will get to reviewing this tomorrow (hopefully)