docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

src/Core/ZB.MOM.WW.OtOpcUa.Configuration/DesignTimeDbContextFactory.cs

@@ -17,6 +17,9 @@ namespace ZB.MOM.WW.OtOpcUa.Configuration;
 /// </remarks>
 public sealed class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<OtOpcUaConfigDbContext>
 {
+    /// <summary>Creates a new DbContext instance for design-time operations.</summary>
+    /// <param name="args">Command-line arguments (unused).</param>
+    /// <returns>The configured DbContext instance.</returns>
     public OtOpcUaConfigDbContext CreateDbContext(string[] args)
     {
         var connection = Environment.GetEnvironmentVariable("OTOPCUA_CONFIG_CONNECTION");