Aetherance opened a new pull request, #3216:
URL: https://github.com/apache/dubbo-go/pull/3216
### Description
在一些情况下，client 配置了 affinity router 时，会直接因为 nil 而段错误
```
2026-02-17 21:27:55 ERROR affinity/router.go:90 Application
affinity router must set application name
2026/02/17 21:27:55 Authenticated: id=72061538416853150, timeout=4000
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xe915e9]
```
该 bug 一般发生在 配置了 application affinity router 时
配置代码:
client:
```go
conn, _, _ := zk.Connect([]string{"127.0.0.1:2181"}, time.Second*5)
defer conn.Close()
conn.Create("/dubbo/config/dubbo/router_affinity_consumer.affinity-router",
[]byte(`configVersion: v3.1
scope: application
key: router_affinity_consumer
enabled: true
runtime: true
affinityAware:
key: region
ratio: 1`), 0, zk.WorldACL(zk.PermAll))
ins, _ := dubbo.NewInstance(
dubbo.WithName("router_affinity_consumer"),
dubbo.WithRegistry(registry.WithZookeeper(),
registry.WithAddress("127.0.0.1:2181")),
dubbo.WithConfigCenter(config_center.WithZookeeper(),
config_center.WithAddress("127.0.0.1:2181"), config_center.WithGroup("dubbo")),
)
cli, _ := ins.NewClient(client.WithClientProtocolTriple())
svc, _ := greet.NewGreetService(cli, client.WithParam("region",
"shanghai"))
ctx := context.WithValue(context.Background(),
constant.DubboCtxKey("attachment"),
map[string]interface{}{"region": "shanghai"},
)
```
server:
```go
ins, _ := dubbo.NewInstance(
dubbo.WithName("router_affinity_provider_a"),
dubbo.WithRegistry(registry.WithZookeeper(),
registry.WithAddress("127.0.0.1:2181")),
)
srv, _ :=
ins.NewServer(server.WithServerProtocol(protocol.WithTriple(),
protocol.WithPort(20000)))
handler := &AffinityGreetServer{}
greet.RegisterGreetServiceHandler(srv, handler,
server.WithParam("region", "hangzhou"))
srv.Serve()
```
该 bug 只会在配置了 application 模式的 affinity router 上出现，如果配置 service 模式的 affinity
router 则不会触发该 bug
bug 原因是当前版本的client应用名未能被正确传递至 router chain。这导致 router chain 在 初始化 affinity
router 时，由于获取到空应用名而直接返回 nil。最终造成 nil 被访问而 panic
本 pr 添加了在 router chain 读取应用名的逻辑来修复此 bug
Fixes #3203
### Checklist
- [x] I confirm the target branch is `develop`
- [x] Code has passed local testing
- [x] I have added tests that prove my fix is effective or that my feature
works
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