feat(diarization): добавлено разделение транскрипта по говорящим

Зачем:
- локальным транскриптам нужна структура реплик для конспектов и протоколов.

Что:
- добавлены пословные таймкоды для всех ASR-бэкендов и сведение с Sherpa-ONNX.
- реализованы CLI-флаги, деградация без потери ASR и speaker Markdown.
- добавлены проверяемый кеш моделей, тесты и документация.

Проверка:
- `pytest` — 283 passed, 1 skipped.
- `pyright` — 0 errors.
- Ruff и `git diff --check` — без ошибок.
- выполнены три контрольных прогона на реальных записях.

uv.lock

@@ -259,11 +259,13 @@ version = "0.1.0"
 source = { editable = "." }
 dependencies = [
     { name = "faster-whisper" },
+    { name = "httpx" },
     { name = "nvidia-cublas-cu12", marker = "platform_machine == 'x86_64' and sys_platform == 'linux'" },
     { name = "onnx-asr", extra = ["cpu", "hub"] },
     { name = "onnxruntime" },
     { name = "openvino-genai", marker = "(platform_machine == 'AMD64' and sys_platform != 'darwin') or (platform_machine == 'x86_64' and sys_platform != 'darwin')" },
     { name = "rich" },
+    { name = "sherpa-onnx" },
     { name = "socksio" },
     { name = "typer" },
 ]
@@ -276,11 +278,13 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "faster-whisper", specifier = ">=1.2.1,<2" },
+    { name = "httpx", specifier = ">=0.28,<1" },
     { name = "nvidia-cublas-cu12", marker = "platform_machine == 'x86_64' and sys_platform == 'linux'", specifier = ">=12.4,<13" },
     { name = "onnx-asr", extras = ["cpu", "hub"], specifier = ">=0.12,<0.13" },
     { name = "onnxruntime", specifier = ">=1.28,<2" },
     { name = "openvino-genai", marker = "(platform_machine == 'AMD64' and sys_platform != 'darwin') or (platform_machine == 'x86_64' and sys_platform != 'darwin')", specifier = ">=2026.3.0.0,<2026.4" },
     { name = "rich", specifier = ">=14.3.3,<15" },
+    { name = "sherpa-onnx", specifier = ">=1.13.5,<2" },
     { name = "socksio", specifier = ">=1.0.0,<2" },
     { name = "typer", specifier = ">=0.24.1,<1" },
 ]
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