refactor!: rename the project from Monitor to MoShiro

Namespaces, assemblies, projects and directories, the solution, binaries,
images, systemd units, config paths, environment variables, protocol method
names, the media type and the raw chunk magic all move to MoShiro/moshiro.
Existing data and deployments are not compatible and must be recreated.
Also fix the architecture tests after the solution layout change and make
the update tests independent of their order.

backend/fleet/src/Fleet.Server.Abstractions/IFleetStore.cs

@@ -2,7 +2,7 @@ using Fleet.Core;
 
 namespace Fleet.Server;
 
-/// <summary>Fleet 服务端需要的存储。产品可以自己实现（Monitor 把它放进 monitor.db）。</summary>
+/// <summary>Fleet 服务端需要的存储。产品可以自己实现（MoShiro 把它放进 moshiro.db）。</summary>
 public interface IFleetStore
 {
     ValueTask<JoinTokenRecord?> FindJoinTokenAsync(ReadOnlyMemory<byte> tokenSha256, CancellationToken ct);