Simplify architecture: remove overengineering, flatten structure

- Remove dead code: cache.py, context_managers.py, decorators.py, flask-limiter
- Replace AudioSource ABC + FakeFile (5 classes) with 4 plain functions
- Replace TempFileManager class with create_temp_file/cleanup_temp_files functions
- Simplify RequestLogger from 233 to 65 lines, remove file reading side-effect
- Convert HistoryLogger and AudioUtils classes to module-level functions
- Remove unused speed_up_audio and audio_speed_factor config
- Flatten single-file directories: shared/, api/, storage/, validation/, async_tasks/, logging/
- Merge logging config + request_logger into single infrastructure/log.py
- Fix request_logging config key (was request_logger)
- Trim CLAUDE.md to high-level only

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/history.py

@@ -0,0 +1,56 @@
+"""
+Модуль history_logger.py — сохранение истории транскрибации в JSON-файлы.
+"""
+
+import os
+import json
+import datetime
+import random
+import string
+from typing import Dict, Any, Optional
+import logging
+
+logger = logging.getLogger('app.history')
+
+# Корневая директория истории (относительно корня проекта)
+_history_root = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), "history")
+
+
+def save_history(result: Dict[str, Any], original_filename: str, config: Dict) -> Optional[str]:
+    """
+    Сохраняет результат транскрибации в файл истории.
+
+    Args:
+        result: Результат транскрибации.
+        original_filename: Исходное имя аудиофайла.
+        config: Конфигурация (проверяется enable_history).
+
+    Returns:
+        Путь к сохранённому файлу или None.
+    """
+    if not config.get("enable_history", False):
+        return None
+
+    try:
+        os.makedirs(_history_root, exist_ok=True)
+
+        now = datetime.datetime.now()
+        date_str = now.strftime("%Y-%m-%d")
+        timestamp_ms = int(now.timestamp() * 1000)
+        random_tag = ''.join(random.choices(string.ascii_lowercase + string.digits, k=4))
+        base_filename = os.path.basename(original_filename)
+
+        date_dir = os.path.join(_history_root, date_str)
+        os.makedirs(date_dir, exist_ok=True)
+
+        history_path = os.path.join(date_dir, f"{timestamp_ms}_{base_filename}_{random_tag}.json")
+
+        with open(history_path, 'w', encoding='utf-8') as f:
+            json.dump(result, f, ensure_ascii=False, indent=2)
+
+        logger.info(f"Результат сохранён в историю: {history_path}")
+        return history_path
+
+    except Exception as e:
+        logger.error(f"Ошибка при сохранении истории: {e}")
+        return None