Adds 2 units and docs for unit 3. nfr-requirements plan

src/SlpModularCms.Modules.Master/Options/MasterModuleOptions.cs

@@ -0,0 +1,10 @@
+namespace SlpModularCms.Modules.Master.Config;
+
+public class MasterModuleOptions
+{
+    public int IntegrityCheckIntervalMinutes { get; set; } = 60;
+    public int HttpTimeoutSeconds { get; set; } = 10;
+    public string? MasterUrl { get; set; }
+    public int CacheMinutes { get; set; } = 60;
+    public string? ApiKey { get; set; }
+}