Перенес примеры в папку MachineLearning верхнего уровня

InstallerSamples/MachineLearning/DataFrameABC/df01.pas

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+// Загрузка и просмотр данных
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  ''');
+  
+  df.Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df01a.pas

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+// Загрузка данных из CSV-файла
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsv('people.csv');
+  df.Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df02.pas

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+// Выбор столбцов (Select)
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  ''');
+  
+  df.Select(['name', 'score']).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df03.pas

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+// Переименование столбцов (Rename)
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  ''');
+  
+  df.Rename('score', 'exam_score').Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df04.pas

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+// Удаление столбцов (Drop)
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  ''');
+  
+  df.Drop(['score']).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df05.pas

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+// Простая фильтрация
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  ''');
+  
+  df.Filter(row -> row.Int('age') >= 21).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df06.pas

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+// Фильтрация с NA
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.Filter(row -> row.IsValid('score')).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df07.pas

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+// Новый числовой столбец
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.WithColumnBool('passed', row -> row.Int('score') >= 80).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df08.pas

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+// Обработка ошибок (NA)
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.WithColumnFloat('normalized', row -> row.Float('score') / 100).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df09.pas

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+// Простые статистики
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.Min('score').Println;
+  df.Mean('score').Println;
+  df.Max('score').Println;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df10.pas

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+// Describe одного столбца
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  var d := df.Describe('score');
+  Print(d.Count,d.Min,d.Max,d.Mean,d.Std);
+end.

InstallerSamples/MachineLearning/DataFrameABC/df11.pas

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+// Describe всех числовых столбцов
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.Describe.PrintLines;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df12.pas

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+// GroupBy + Count
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.GroupBy('age').Count.Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df13.pas

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+// GroupBy + Mean
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.GroupBy('age').Mean('score').Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df14.pas

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+// GroupBy + Describe
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.GroupBy('age').Describe('score').Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df15.pas

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+// Inner Join
+uses DataFrameABC;
+
+begin
+  var students := DataFrame.FromCsvText('''
+  id,name
+  1,Alice
+  2,Bob
+  3,Charlie
+  ''');
+  
+  var scores := DataFrame.FromCsvText('''
+  id,score
+  1,85
+  2,90
+  4,70
+  ''');
+  
+  students.Join(scores, 'id').Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df16.pas

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+// Left Join
+uses DataFrameABC;
+
+begin
+  var students := DataFrame.FromCsvText('''
+  id,name
+  1,Alice
+  2,Bob
+  3,Charlie
+  ''');
+  
+  var scores := DataFrame.FromCsvText('''
+  id,score
+  1,85
+  2,90
+  4,70
+  ''');
+  
+  students.Join(scores, 'id', jkLeft).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df17.pas

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+// Full Join
+uses DataFrameABC;
+
+begin
+  var students := DataFrame.FromCsvText('''
+  id,name
+  1,Alice
+  2,Bob
+  3,Charlie
+  ''');
+  
+  var scores := DataFrame.FromCsvText('''
+  id,score
+  1,85
+  2,90
+  4,70
+  ''');
+  
+  students.Join(scores, 'id', jkFull).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df18.pas

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+// Сортировка
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  ''');
+
+  df.SortBy('score', descending := True).Print;
+end.

InstallerSamples/MachineLearning/DataFrameABC/df19.pas

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+// Просмотр больших данных
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.PrintPreview(3);
+end.

InstallerSamples/MachineLearning/DataFrameABC/df20.pas

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+// Полный аналитический сценарий
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df
+  .Filter(r -> r.IsValid('score'))
+  .SortBy('age', descending := True)
+  .GroupBy('age')
+  .Mean('score')
+  .PrintPreview(3);
+end.

InstallerSamples/MachineLearning/DataFrameABC/df21.pas

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+// Сортировка по нескольким полям
+uses DataFrameABC;
+
+begin
+  var df := DataFrame.FromCsvText('''
+  name,age,score
+  Alice,20,85
+  Bob,22,90
+  Charlie,21,78
+  Bob,22,90
+  Clara,,78
+  Kat,21,NA
+  ''');
+  
+  df.Filter(r -> r.IsValid('score'))
+    .SortBy(['age','score'],[True,True])
+    .Println;
+end.

InstallerSamples/MachineLearning/DataFrameABC/people.csv

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+name,age,score
+Alice,20,85
+Bob,22,90
+Charlie,21,78