egg skills

[killagu]

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skills for egg next

[gxkl]

Related PRs:

• docs: init skills #5783 docs: init skills
• feat(skills): add ajv-validate and background-task skills with eval framework #5834 feat(skills): add ajv-validate and background-task skills with eval framework
• feat(skills): add EventBus and AOP skill content #5835 feat(skills): add EventBus and AOP skill content