Proper design for `init_wfc` needed

[Cstandardlib]

Describe the Code Quality Issue

Now abacus will quit if init_wfc is set to atomic(default) while no atomic wfcs are read from pseudopotentials, leaving a warning message.

1. Since the atomic option is the default option it is better to pop a warning but not quit and complete the calculation.
2. Need to output information like "aaa atomic + bbb random" for all cases.
3. Update the docs and inform users of atomic->random degeneration on pseupotentials without PP_PSWFC.

Additional Context

No response

Task list for Issue attackers (only for developers)

• Identify the specific code file or section with the code quality issue.
• Investigate the issue and determine the root cause.
• Research best practices and potential solutions for the identified issue.
• Refactor the code to improve code quality, following the suggested solution.
• Ensure the refactored code adheres to the project's coding standards.
• Test the refactored code to ensure it functions as expected.
• Update any relevant documentation, if necessary.
• Submit a pull request with the refactored code and a description of the changes made.