refactor: rename manager codebase dir new-api → heicode, module github.com/heicode/manager

Remove user-facing new-api naming; Docker/network/container names use heicode.
Go imports updated; Dockerfiles and workflows ldflags fixed.

Made-with: Cursor

heicode/heicode.service

@@ -0,0 +1,18 @@
+# File path: /etc/systemd/system/heicode.service
+# sudo systemctl daemon-reload
+# sudo systemctl start heicode
+# sudo systemctl enable heicode
+# sudo systemctl status heicode
+[Unit]
+Description=Heicode Manager (gateway)
+After=network.target
+
+[Service]
+User=ubuntu  # 注意修改用户名
+WorkingDirectory=/path/to/heicode  # 注意修改路径
+ExecStart=/path/to/heicode/heicode --port 3000 --log-dir /path/to/heicode/logs  # 注意修改路径和端口号
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target