docs(mem_cube): align MemCube docs with GeneralMemCube

[CaralHsi]

Summary

Align MemCube documentation with the current implementation in MemOS (including and updated method signatures).

Changes

• Updated to:
  • Document alongside //
  • Update initialization snippet to use
  • Update method signatures (/ with , )

Verification

• All referenced classes exist in code (Check 1)
• Import paths verified (Check 2)
• Method signatures match code (Check 3)
• Config fields match code (Check 4)
• API endpoints match code (Check 5, if applicable)

Cross-Language

• Chinese () counterpart checked
• Needs follow-up: update (if present)

Code Reference

Based on MemOS commit: