fix(audit): ScadaBridge C3 review — safe enum-parse (fallback) in SqliteAuditWriter.MapRow + AuditEventDtoMapper.FromDto (Task 2.5)

src/ZB.MOM.WW.ScadaBridge.Commons/Types/Audit/AuditRowProjection.cs

@@ -173,7 +173,13 @@ public static class AuditRowProjection
         return evt with { DetailsJson = AuditDetailsCodec.Serialize(d) };
     }
 
-    private static TEnum ParseEnum<TEnum>(string? value, TEnum fallback) where TEnum : struct, Enum
+    /// <summary>
+    /// Case-sensitive <see cref="Enum.TryParse{TEnum}"/> with a caller-supplied fallback.
+    /// Returns <paramref name="fallback"/> when <paramref name="value"/> is null, empty,
+    /// or does not match any declared member name — so callers never throw on an
+    /// unknown/renamed enum string (legacy or corrupt rows degrade gracefully).
+    /// </summary>
+    public static TEnum ParseEnum<TEnum>(string? value, TEnum fallback) where TEnum : struct, Enum
         => !string.IsNullOrEmpty(value) && Enum.TryParse<TEnum>(value, ignoreCase: false, out var parsed)
             ? parsed
             : fallback;