refactor: 重构项目结构，分离路由注册与主函数入口

- 将路由注册逻辑从主函数移至独立的 router 包
- 更新 main.go 以调用新的路由注册函数
- 删除旧的 digitalhuman/main.go 文件
- 简化常量文件中的注释

main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"context"
+
+	digitalhuman "digital-human/digitalhuman/router"
+
+	_ "gitea.com/red-future/common/config"
+	"gitea.com/red-future/common/jaeger"
+	_ "gitea.com/red-future/common/ragflow"
+	_ "github.com/gogf/gf/contrib/drivers/pgsql/v2"
+	_ "github.com/gogf/gf/contrib/nosql/redis/v2"
+)
+
+func main() {
+	ctx := context.Background()
+	defer jaeger.ShutDown(ctx)
+	// 注册路由
+	digitalhuman.Router()
+
+	// 保持应用运行
+	select {}
+}