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/src/MoShiro.Backend.Api/OpsEndpoints.cs

@@ -0,0 +1,53 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Routing;
+using MoShiro.Backend.Application;
+using MoShiro.Protocol;
+
+namespace MoShiro.Backend.Api;
+
+/// <summary>运维端点：<c>/healthz</c>、<c>/metrics</c>（admin 令牌）、安装脚本。</summary>
+public static class OpsEndpoints
+{
+    private const string Tag = "ops";
+
+    public static void Map(IEndpointRouteBuilder app)
+    {
+        app.MapGet("/healthz", HealthAsync)
+            .Api("health_get", "SQLite and the raw data directory are both writable", Tag)
+            .Returns<HealthDto>().ProducesProblems(503);
+        app.MapGet("/metrics", MetricsAsync)
+            .Api("metrics_get", "Prometheus metrics (admin token)", Tag)
+            .Produces(StatusCodes.Status200OK, contentType: "text/plain").ProducesProblems(401, 403);
+        app.MapGet("/install.sh", (HttpContext http) => NotShipped(http))
+            .Api("install_sh", "Installer for Linux nodes", Tag).ProducesProblems(501);
+        app.MapGet("/install.ps1", (HttpContext http) => NotShipped(http))
+            .Api("install_ps1", "Installer for Windows nodes", Tag).ProducesProblems(501);
+    }
+
+    private static async Task<IResult> HealthAsync(HttpContext http, OpsService ops)
+    {
+        StorageHealth health = await ops.HealthAsync(http.RequestAborted);
+        bool ok = health.Database && health.RawDirectory;
+        HealthDto dto = new(ok ? "ok" : "unavailable", health.Database, health.RawDirectory);
+        http.Response.Headers.CacheControl = "no-store";
+        return TypedResults.Json(dto, ApiJsonContext.Default.HealthDto, statusCode: ok ? StatusCodes.Status200OK : StatusCodes.Status503ServiceUnavailable);
+    }
+
+    private static async Task<IResult> MetricsAsync(HttpContext http, OpsService ops)
+    {
+        Principal principal = http.GetPrincipal();
+        if (!principal.IsAdmin)
+        {
+            return principal.CanRead
+                ? Problems.Create(http, MoShiroErrors.Forbidden, "an admin token is required")
+                : Problems.Create(http, MoShiroErrors.Unauthorized, "an admin token is required");
+        }
+
+        return TypedResults.Text(await ops.RenderPrometheusAsync(http.RequestAborted), "text/plain; version=0.0.4");
+    }
+
+    /// <summary>安装脚本需要下载节点程序的发布物，那属于打包与部署（M6），目前还没有。</summary>
+    private static IResult NotShipped(HttpContext http) =>
+        Problems.Create(http, StatusCodes.Status501NotImplemented, ErrorCodeHttpMap.NotImplemented.Value, "the node installer ships with packaging (M6)");
+}