Enhance method header generation to include location type

src/Linqraft.SourceGenerator/SelectExprInfo.cs

@@ -34,6 +34,9 @@ internal abstract record SelectExprInfo
     // Get the namespace where DTOs will be placed
     protected abstract string GetDtoNamespace();
 
+    // Get expression type string (for documentation)
+    protected abstract string GetExprTypeString();
+
     // Get the full name for a nested DTO class (can be overridden for nested class support)
     protected virtual string GetNestedDtoFullName(string nestedClassName)
     {
@@ -132,10 +135,13 @@ protected string GetLocationId()
 
     protected string GenerateMethodHeaderPart(string dtoName, InterceptableLocation location)
     {
+        var typeString = GetExprTypeString();
+        var displayLocationRaw = location.GetDisplayLocation();
+        var locationFileOnly = displayLocationRaw.Split(['/', '\\']).Last();
         return $"""
             /// <summary>
-            /// generated select expression method {dtoName} <br/>
-            /// at {location.GetDisplayLocation()}
+            /// generated select expression method {dtoName} ({typeString}) <br/>
+            /// at {locationFileOnly}
             /// </summary>
             {location.GetInterceptsLocationAttributeSyntax()}
             """;

src/Linqraft.SourceGenerator/SelectExprInfoAnonymous.cs

@@ -33,6 +33,9 @@ protected override DtoStructure GenerateDtoStructure()
     // Anonymous types don't generate separate DTOs, but return caller namespace for consistency
     protected override string GetDtoNamespace() => CallerNamespace;
 
+    // Get expression type string (for documentation)
+    protected override string GetExprTypeString() => "anonymous";
+
     // Generate SelectExpr method
     protected override string GenerateSelectExprMethod(
         string dtoName,

src/Linqraft.SourceGenerator/SelectExprInfoExplicitDto.cs

@@ -119,6 +119,9 @@ protected override string GetClassName(DtoStructure structure) =>
     // Get the namespace where DTOs will be placed
     protected override string GetDtoNamespace() => GetActualDtoNamespace();
 
+    // Get expression type string (for documentation)
+    protected override string GetExprTypeString() => "explicit";
+
     // Get the full name for a nested DTO class (including parent classes)
     protected override string GetNestedDtoFullName(string nestedClassName)
     {
@@ -169,11 +172,7 @@ InterceptableLocation location
         var id = GetUniqueId();
         var methodDecl =
             $"public static {returnTypePrefix}<TResult> SelectExpr_{id}<TIn, TResult>(";
-        sb.AppendLine($"/// <summary>");
-        sb.AppendLine($"/// generated select expression method {dtoName} (explicit)");
-        sb.AppendLine($"/// at {location.GetDisplayLocation()}");
-        sb.AppendLine($"/// </summary>");
-        sb.AppendLine($"{location.GetInterceptsLocationAttributeSyntax()}");
+        sb.AppendLine(GenerateMethodHeaderPart(dtoName, location));
         sb.AppendLine($"{methodDecl}");
         sb.AppendLine($"    this {returnTypePrefix}<TIn> query,");
         sb.AppendLine($"    Func<TIn, object> selector) where TResult : {dtoFullName}");

src/Linqraft.SourceGenerator/SelectExprInfoNamed.cs

@@ -36,6 +36,9 @@ protected override string GetParentDtoClassName(DtoStructure structure) =>
     protected override string GetDtoNamespace() =>
         SourceType.ContainingNamespace?.ToDisplayString() ?? CallerNamespace;
 
+    // Get expression type string (for documentation)
+    protected override string GetExprTypeString() => "predefined";
+
     protected override string GenerateSelectExprMethod(
         string dtoName,
         DtoStructure structure,