添加测试功能：TCP 写入服务端、单次发送客户端、压力测试客户端、kprobe Hello World基础验证

demo/client.py

@@ -0,0 +1,33 @@
+"""TCP 单次发送客户端：发送 3 条测试消息，验证基本连通性"""
+
+import socket
+import time
+
+HOST = "127.0.0.1"
+PORT = 8888
+MESSAGE_COUNT = 3
+
+
+def send_once(index: int) -> bool:
+    try:
+        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        client.settimeout(5)
+        client.connect((HOST, PORT))
+        msg = f"test_message_{index}_{time.time()}"
+        client.send(msg.encode("utf-8"))
+        reply = client.recv(1024)
+        client.close()
+        print(f"消息 {index} 发送成功，回复: {reply.decode('utf-8', errors='replace')}")
+        return True
+    except Exception as exc:
+        print(f"消息 {index} 失败: {exc}")
+        return False
+
+
+if __name__ == "__main__":
+    print(f"开始连通性测试: 发送 {MESSAGE_COUNT} 条消息到 {HOST}:{PORT}")
+    success = 0
+    for i in range(MESSAGE_COUNT):
+        if send_once(i):
+            success += 1
+    print(f"完成: 成功 {success}/{MESSAGE_COUNT}")