fix(host): resolve Host-012..015 — consume DownIfAlone in HOCON, sub-second timing precision, config-driven Serilog sinks, transient-only startup retry

src/ScadaLink.Host/appsettings.json

@@ -3,5 +3,26 @@
     "LogLevel": {
       "Default": "Information"
     }
+  },
+  "Serilog": {
+    "Using": [
+      "Serilog.Sinks.Console",
+      "Serilog.Sinks.File"
+    ],
+    "WriteTo": [
+      {
+        "Name": "Console",
+        "Args": {
+          "outputTemplate": "[{Timestamp:HH:mm:ss} {Level:u3}] [{NodeRole}/{NodeHostname}] {Message:lj}{NewLine}{Exception}"
+        }
+      },
+      {
+        "Name": "File",
+        "Args": {
+          "path": "logs/scadalink-.log",
+          "rollingInterval": "Day"
+        }
+      }
+    ]
   }
 }