Refactor Scheduler Handlers, Context Naming, and Dispatcher Logic

[tangg555]

Description

Summary: (summary)

This PR focuses on refactoring the memory scheduler and dispatcher modules to improve code clarity, fix import issues, and standardize handler implementation.

Key Changes

• Code Clarity & Naming:

  • Renamed ctx to scheduler_context in GeneralScheduler and SchedulerHandlerRegistry to improve readability.
  • Standardized logic by extracting common functionality into BaseSchedulerHandler .

• Dispatcher & Config Sync:

  • Ensured orchestrator configuration is properly synced and removed when unregistering handlers in the dispatcher.
  • Fixed TaskPriorityLevel imports and usage in the dispatcher.

• Fixes:

  • Corrected the register_handlers signature in BaseSchedulerQueueMixin .
  • Fixed handler registry imports, relative import paths, and the initialization map.

Fix: #(issue)

Docs Issue/PR: (docs-issue-or-pr-link)

Reviewer: @(reviewer)

Checklist:

• I have performed a self-review of my own code | 我已自行检查了自己的代码
• I have commented my code in hard-to-understand areas | 我已在难以理解的地方对代码进行了注释
• I have added tests that prove my fix is effective or that my feature works | 我已添加测试以证明我的修复有效或功能正常
• I have created related documentation issue/PR in MemOS-Docs (if applicable) | 我已在 MemOS-Docs 中创建了相关的文档 issue/PR（如果适用）
• I have linked the issue to this PR (if applicable) | 我已将 issue 链接到此 PR（如果适用）
• I have mentioned the person who will review this PR | 我已提及将审查此 PR 的人