📝 CodeRabbit Chat: Implement requested code changes

[coderabbitai]

Code changes was requested by @awsl233777.

• feat: 无前端模式 + 前端可指定后端地址 (headless mode & configurable backend) #598 (comment)

The following files were modified:

• internal/handler/static.go
• internal/handler/static_test.go

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