feat(delmia-notifier): config loader + SCADABRIDGE_API_KEY resolution

src/ZB.MOM.WW.ScadaBridge.DelmiaNotifier/ConfigLoader.cs

@@ -0,0 +1,38 @@
+using System.Text.Json;
+
+namespace ZB.MOM.WW.ScadaBridge.DelmiaNotifier;
+
+/// <summary>Reads and interprets the notifier's configuration and secret. Parse logic is string-based so it is unit-testable without touching disk.</summary>
+internal static class ConfigLoader
+{
+    private const string ApiKeyEnvVar = "SCADABRIDGE_API_KEY";
+
+    /// <summary>Deserialize the <c>appsettings.json</c> text via the source-gen context.</summary>
+    public static NotifierConfig Load(string jsonText) =>
+        JsonSerializer.Deserialize(jsonText, NotifierJsonContext.Default.NotifierConfig) ?? new NotifierConfig();
+
+    /// <summary>Read and parse the <c>appsettings.json</c> sitting next to the executable.</summary>
+    public static NotifierConfig LoadFromDefaultFile()
+    {
+        var path = Path.Combine(AppContext.BaseDirectory, "appsettings.json");
+        return Load(File.ReadAllText(path));
+    }
+
+    /// <summary>Split a comma-separated base-URL list into trimmed, non-empty entries.</summary>
+    public static string[] SplitBaseUrls(string? baseUrls)
+    {
+        if (string.IsNullOrWhiteSpace(baseUrls))
+        {
+            return [];
+        }
+
+        return baseUrls.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+    }
+
+    /// <summary>Resolve the API key from <c>SCADABRIDGE_API_KEY</c>; null/whitespace → null. Env accessor is injected for testability.</summary>
+    public static string? ResolveApiKey(Func<string, string?> envGet)
+    {
+        var key = envGet(ApiKeyEnvVar);
+        return string.IsNullOrWhiteSpace(key) ? null : key;
+    }
+}

src/ZB.MOM.WW.ScadaBridge.DelmiaNotifier/NotifierConfig.cs

@@ -0,0 +1,19 @@
+namespace ZB.MOM.WW.ScadaBridge.DelmiaNotifier;
+
+/// <summary>Root of <c>appsettings.json</c>; mirrors the <c>ScadaBridge</c> section only.</summary>
+internal sealed class NotifierConfig
+{
+    public ScadaBridgeSection ScadaBridge { get; set; } = new();
+}
+
+internal sealed class ScadaBridgeSection
+{
+    /// <summary>Comma-separated failover list of base URLs (the method path is appended by the app).</summary>
+    public string? BaseUrls { get; set; }
+
+    /// <summary>Per-attempt HTTP timeout in seconds.</summary>
+    public int TimeoutSeconds { get; set; } = 30;
+
+    /// <summary>Optional diagnostic log file (relative to the exe); null/omitted → stderr only.</summary>
+    public string? LogPath { get; set; }
+}

src/ZB.MOM.WW.ScadaBridge.DelmiaNotifier/NotifierJsonContext.cs

@@ -4,4 +4,5 @@ namespace ZB.MOM.WW.ScadaBridge.DelmiaNotifier;
 
 [JsonSerializable(typeof(RecipeDownload))]
 [JsonSerializable(typeof(RecipeDownloadResult))]
+[JsonSerializable(typeof(NotifierConfig))]
 internal partial class NotifierJsonContext : JsonSerializerContext;