feat: remove Gin and standardize on nethttp

logx/README.md

@@ -1,6 +1,6 @@
 # logx
 
-`logx` 是 GoOmni 的业务层结构化日志入口。业务代码不需要依赖 Gin：
+`logx` 是 GoOmni 的业务层结构化日志入口。业务代码不需要依赖具体网络库：
 
 ```go
 import "git.yuntuo.hk/k2safe/go-omni/logx"

logx/logx.go

@@ -1,5 +1,5 @@
 // Package logx provides the application logger used by GoOmni and business
-// packages. Its public API is deliberately independent of Gin so the same
+// packages. Its public API is deliberately independent of the network layer so the same
 // logger can be used from HTTP handlers, jobs and command line programs.
 package logx