fix: name Node SSR upstream ssr

AGENTS_CHANGELOG.md

@@ -16,6 +16,7 @@
 - `hostnginx` 新增 Node SSR 受控 upstream 区块解析、活动端口读取和硬切换渲染：
   `# yms-update managed nodeSsr upstream begin/end`。
 - Node SSR Nginx 逻辑入口端口为 `8910`；受控 upstream 后端为 `18910`、`28910`。
+- Node SSR upstream 名称冻结为 `ssr`，受控标记为 `# yms-update managed ssr upstream begin/end`。
 
 ### 尚未完成
 

internal/hostnginx/nodessr.go

@@ -9,8 +9,8 @@ import (
 )
 
 const (
-	nodeSsrManagedBegin = "# yms-update managed nodeSsr upstream begin"
-	nodeSsrManagedEnd   = "# yms-update managed nodeSsr upstream end"
+	nodeSsrManagedBegin = "# yms-update managed ssr upstream begin"
+	nodeSsrManagedEnd   = "# yms-update managed ssr upstream end"
 	nodeSsrPort18910    = 18910
 	nodeSsrPort28910    = 28910
 )

internal/hostnginx/nodessr_test.go

@@ -6,10 +6,10 @@ import (
 )
 
 const nodeSsrConfiguration = `events {}
-# yms-update managed nodeSsr upstream begin
+# yms-update managed ssr upstream begin
 # server 127.0.0.1:18910 max_fails=1 fail_timeout=2s;
 server 127.0.0.1:28910 max_fails=1 fail_timeout=2s;
-# yms-update managed nodeSsr upstream end
+# yms-update managed ssr upstream end
 `
 
 func TestActiveNodeSsrPort(t *testing.T) {