refactor: Refactor apps manage pages with new page structure

Created by: leoendless

Signed-off-by: leoliu leoliu@yunify.com

What type of PR is this?

/kind optimization

What this PR does / why we need it:

Use composition instead of inheritance, improving the readability of this part of the code.

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Additional documentation, usage docs, etc.: