[Dependency] Solver `source_hsolver` depending back on the method layer

[Critsium-xy]

Describe the Code Quality Issue

• Symptom: includes pw/module_stodft/*, pw/hamilt_pw.h, pw/hamilt_lcaopw.h, lcao/rho_tau_lcao.h.
• Fix: hsolver should depend only on hamilt's abstract operator interface and the psi container; concrete hamilt_pw/sdft/lcaopw should be wired in via the L2 operator base class polymorphically, injected from above.
• Acceptance: cut hsolver → pw/lcao.

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.