Support Vaka memory templates via a switch

[fujiajie666]

Description

Using enable_vaka_template field as a switch to enable custom memory templates for Vaka.

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

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Additional Notes

[github-actions]

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🧪 PR contains tests

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⚡ Recommended focus areas for review Dead Code The else block on lines 489-490 sets memory_templates_dir but does not use it, resulting in dead code. This likely stems from a logic change where the bundled templates directory is now always used as the first entry in self._schema_directories. else: memory_templates_dir = str(resolve_memory_templates_dir())

[github-actions]

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[huangruiteng]

这里做成 config.memory.template_type == 'vaka' 的拓展性更好？