feat: map canonical ZB health tiers; replace bypassing /health/live

src/ZB.MOM.WW.MxGateway.Server/GatewayApplication.cs

@@ -2,6 +2,7 @@ using System.Security.Cryptography.X509Certificates;
 using Microsoft.AspNetCore.Hosting.StaticWebAssets;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Configuration;
+using ZB.MOM.WW.Health;
 using ZB.MOM.WW.MxGateway.Contracts;
 using ZB.MOM.WW.MxGateway.Server.Alarms;
 using ZB.MOM.WW.MxGateway.Server.Configuration;
@@ -63,7 +64,11 @@ public static class GatewayApplication
         builder.Services.AddGatewayConfiguration();
         builder.Services.AddSqliteAuthStore();
         builder.Services.AddGatewayGrpcAuthorization();
-        builder.Services.AddHealthChecks();
+        builder.Services.AddHealthChecks()
+            .AddTypeActivatedCheck<AuthStoreHealthCheck>(
+                "auth-store",
+                failureStatus: null,
+                tags: new[] { ZbHealthTags.Ready });
         builder.Services.AddSingleton<GatewayMetrics>();
         builder.Services.AddSingleton<MxAccessGrpcMapper>();
         builder.Services.AddSingleton<MxAccessGrpcRequestValidator>();
@@ -169,13 +174,7 @@ public static class GatewayApplication
     {
         endpoints.MapStaticAssets(ResolveStaticAssetsManifestPath());
 
-        endpoints.MapGet(
-                "/health/live",
-                () => Results.Ok(new GatewayHealthReply(
-                    Status: "Healthy",
-                    DefaultBackend: GatewayContractInfo.DefaultBackendName,
-                    WorkerProtocolVersion: GatewayContractInfo.WorkerProtocolVersion)))
-            .WithName("LiveHealth");
+        endpoints.MapZbHealth();
 
         endpoints.MapGrpcService<MxAccessGatewayService>();
         endpoints.MapGrpcService<GalaxyRepositoryGrpcService>();