refactor!: rename the project from Monitor to MoShiro [CI]

Namespaces, assemblies, solution, binaries, images, systemd units, config paths, environment variables, protocol methods and the Linux user are all renamed. Breaking: existing databases, node identities and installed units must be recreated.

backend/fleet/tools/fleet-enroll/Program.cs

@@ -2,7 +2,7 @@ using System.Text.Json.Nodes;
 using Fleet.Core;
 using Fleet.Enrollment.Client;
 
-// fleet-enroll --server https://panel --join jt_xxx --name jp-1 --identity-dir /etc/monitor [--meta '{"probe_tcp_port":7443,...}'] [--version 1.0]
+// fleet-enroll --server https://panel --join jt_xxx --name jp-1 --identity-dir /etc/moshiro [--meta '{"probe_tcp_port":7443,...}'] [--version 1.0]
 // 一次性运行：生成身份、注册、写入身份目录，然后退出。
 string? Arg(string name) => args.SkipWhile(a => a != name).Skip(1).FirstOrDefault();