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/shared/tests/MoShiro.Measurement.Tests/PlatformDetectorTests.cs

@@ -0,0 +1,27 @@
+namespace MoShiro.Measurement.Tests;
+
+public sealed class PlatformDetectorTests
+{
+    [Theory]
+    [InlineData("PRETTY_NAME=\"Debian GNU/Linux 12 (bookworm)\"|NAME=\"Debian GNU/Linux\"|VERSION_ID=\"12\"|ID=debian", "Debian 12")]
+    [InlineData("NAME=\"OpenWrt\"|VERSION_ID=\"24.10.0\"|ID=openwrt", "OpenWrt 24.10")]
+    [InlineData("NAME=\"Alpine Linux\"|ID=alpine|VERSION_ID=3.22.1", "Alpine Linux 3.22")]
+    [InlineData("NAME=\"Ubuntu\"|VERSION_ID=\"24.04\"", "Ubuntu 24.04")]
+    [InlineData("ID=arch", "arch")]
+    [InlineData("", "Linux")]
+    public void LinuxName_IsTheDistroAndItsMajorMinorVersion(string osRelease, string expected)
+    {
+        Assert.Equal(expected, PlatformDetector.LinuxName(osRelease.Split('|', StringSplitOptions.RemoveEmptyEntries)));
+    }
+
+    [Fact]
+    public void Detect_ReportsOnlyCoarseInformation()
+    {
+        var platform = PlatformDetector.Detect();
+        Assert.Contains(platform.Os, new[] { "linux", "windows", "macos", "other" });
+        Assert.Contains(platform.Arch, new[] { "x64", "arm64", "arm", "x86" });
+        // 没有主机名、内核版本：名字很短，也不含小数点以外的版本细节
+        Assert.True((platform.Name ?? string.Empty).Length < 40);
+        Assert.DoesNotContain(Environment.MachineName, platform.Name ?? string.Empty, StringComparison.OrdinalIgnoreCase);
+    }
+}