bug: homeURL hardcoded in keycloak_oauth.go

[bob-ros2]

Describe the Bug

homeURL 'https://chat.jan.ai/' hardcoded here:
https://github.com/janhq/server/blob/main/services/llm-api/internal/interfaces/httpserver/handlers/authhandler/keycloak_oauth.go#L246

This should be configurable.

Steps to Reproduce

No response

Screenshots / Logs

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Operating System

None

Version

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Additional Context

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[locnguyen1986]

Thanks @bob-ros2 for poiting that,
We are update whole repo for packaging setup which should elimniate all hard values, will update it when fix soon