feat(v2): T2 运维层 hw_profile + llama_server 进程管理

tests/_ports.py

@@ -0,0 +1,8 @@
+"""测试辅助：获取空闲 TCP 端口。"""
+import socket
+
+
+def free_port() -> int:
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        s.bind(("127.0.0.1", 0))
+        return s.getsockname()[1]