[I] [BUG] Polaris 路由规则失效 [dubbo-go]

[via GitHub]

zbchi opened a new issue, #3181:
URL: https://github.com/apache/dubbo-go/issues/3181

   ### ✅ 验证清单
   
   - [x] 🔍 我已经搜索过 [现有 
Issues](https://github.com/apache/dubbo-go/issues)，确信这不是重复问题
   
   ### 🚀 Go 版本
   
   1.24.0
   
   ### 📦 Dubbo-go 版本
   
   v3.3.1
   
   ### 🖥️ 服务端配置
   
   _No response_
   
   ### 💻 客户端配置
   
   _No response_
   
   ### 🌐 协议配置
   
   Triple
   
   ### 📋 注册中心配置
   
   _No response_
   
   ### 💾 操作系统
   
   🐧 Linux
   
   ### 📝 Bug 描述
   
   流量未命中预期的服务实例
   
   ### 🔄 重现步骤
   
   server-dev:
   ```go
        polarisAddr := "127.0.0.1:8091"
   
        ins, err := dubbo.NewInstance(
                dubbo.WithName("myApp"),
                dubbo.WithRegistry(
                        registry.WithPolaris(),
                        registry.WithAddress(polarisAddr),
                        registry.WithNamespace("dubbogo"),
                        registry.WithRegisterInterface(),
                ),
                dubbo.WithProtocol(
                        protocol.WithTriple(),
                        protocol.WithPort(20000),
                ),
        )
     
        server.WithParam("env", "dev"),
   ```
   server-pre:
   ```go
        ...
        server.WithParam("env", "pre")
   ```
   server-prod:
   ```go
        ...
        server.WithParam("env", "prod")
   ```
   client:
   ```go
        uid := os.Getenv("uid")
   
        for i := 0; i < 5; i++ {
                time.Sleep(200 * time.Millisecond)
                req := &user.User{Name: "Alex001"}
                ctx := context.WithValue(context.Background(), 
constant.AttachmentKey, map[string]interface{}{
                        "uid": uid,
                })
                resp, err := svc.GetUser(ctx, req)
           }
   ```
   
   配置路由规则：
   ```
   uid=user-1   ->    pre
   uid=user-2   ->    dev
   其他          ->    prod
   ```
   同时运行三个服务实例，并分别对不同的uid进行路由测试
   
   
   ### ✅ 预期行为
   
   ```
   uid=user-1   ->    pre
   uid=user-2   ->    dev
   其他          ->    prod
   ```
   
   ### ❌ 实际行为
   
   路由规则失效，打入默认服务实例：
   ```
   #export uid=user-1
   2026-01-24 19:41:12     INFO    cmd/client.go:78        uid=user-1, 
response: Alex Stocks:{id:"A001" name:"[Prod] User" age:18 time:1769254872}
   
   2026-01-24 19:41:12     INFO    cmd/client.go:78        uid=user-1, 
response: Alex Stocks:{id:"A001" name:"[Prod] User" age:18 time:1769254872}
   
   #export uid=user-2
   2026-01-24 19:43:08     INFO    cmd/client.go:78        uid=user-2, 
response: Alex Stocks:{id:"A001" name:"[Prod] User" age:18 time:1769254988}
   
   2026-01-24 19:43:08     INFO    cmd/client.go:78        uid=user-2, 
response: Alex Stocks:{id:"A001" name:"[Prod] User" age:18 time:1769254988}
   
   ### 💡 可能的解决方案
   
   从ctx读取attachements发生在路由选择之后


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