feat: add expressive offline Russian book TTS

tools/tts/run_booktts_student_windows.ps1

@@ -0,0 +1,27 @@
+param(
+    [string]$Root = 'C:\Users\seven\AletheiaBookTTS',
+    [string]$DatasetName = 'student-dataset-100000',
+    [string]$OutputName = 'student-100k-v1',
+    [int]$Epochs = 20,
+    [int]$BatchSize = 32,
+    [double]$ValidationFraction = 0.05,
+    [int]$EarlyStoppingPatience = 4,
+    [switch]$Resume
+)
+
+$ErrorActionPreference = 'Stop'
+$env:PYTHONUTF8 = '1'
+$env:PYTHONIOENCODING = 'utf-8'
+$python = Join-Path $Root '.venv\Scripts\python.exe'
+$trainer = Join-Path $Root 'work\booktts_student.py'
+$dataset = Join-Path $Root "work\$DatasetName"
+$output = Join-Path $Root "work\$OutputName"
+$arguments = @(
+    $trainer, 'train', '--dataset', $dataset, '--output', $output,
+    '--epochs', $Epochs, '--batch-size', $BatchSize,
+    '--validation-fraction', $ValidationFraction,
+    '--early-stopping-patience', $EarlyStoppingPatience
+)
+if ($Resume) { $arguments += '--resume' }
+& $python @arguments
+exit $LASTEXITCODE