支持web config runtime northbound多副本

[hhhhsc701]

开启需要修改nexnet/values.yaml中的replicacount

[codecov]

Codecov Report

❌ Patch coverage is 98.37662% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/services/agent_service.py	95.23%	0 Missing and 3 partials ⚠️
backend/services/runtime_state_service.py	98.96%	2 Missing ⚠️

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