feat: 实现日志自动删除功能并更新配置管理

本次提交主要包含以下内容：

1.  **日志自动删除功能**:
    *   新增环境变量 (`AUTO_DELETE_ERROR_LOGS_ENABLED`, `AUTO_DELETE_ERROR_LOGS_DAYS`, `AUTO_DELETE_REQUEST_LOGS_ENABLED`, `AUTO_DELETE_REQUEST_LOGS_DAYS`) 用于控制错误日志和请求日志的自动删除策略。
    *   在 `app/config/config.py` 中添加了对这些新配置项的支持和验证逻辑 (Pydantic `validator` 更新为 `field_validator`)。
    *   修改了 `app/log/logger.py` 以适应新的日志配置。
    *   新增 `app/scheduler/scheduled_tasks.py` 用于执行定期的日志清理任务。
    *   新增 `app/service/error_log/error_log_service.py` 和 `app/service/request_log/request_log_service.py` 来处理具体的日志删除逻辑。
    *   更新了 `app/router/error_log_routes.py` 和 `app/router/scheduler_routes.py` 以集成新功能。

2.  **前端配置页面更新**:
    *   在 `app/templates/config_editor.html` 和 `app/static/js/config_editor.js` 中添加了用于配置日志自动删除选项的用户界面元素。

3.  **代码和文件结构调整**:
    *   删除了不再使用的 `app/scheduler/key_checker.py` 文件。
    *   在 `.gitignore` 文件中添加了 `default_db` 以忽略该目录。

4.  **其他**:
    *   对 `app/core/application.py` 进行了相应调整。

该更新旨在增强应用的日志管理能力，提供更灵活的日志保留策略，并优化了配置界面的用户体验。

app/service/error_log/error_log_service.py

@@ -0,0 +1,155 @@
+from datetime import datetime, timedelta, timezone
+from typing import Any, Dict, List, Optional
+
+from sqlalchemy import delete, func, select
+
+from app.config.config import settings
+from app.database import services as db_services
+from app.database.connection import database
+from app.database.models import ErrorLog
+from app.log.logger import get_error_log_logger
+
+logger = get_error_log_logger()
+
+
+async def delete_old_error_logs():
+    """
+    Deletes error logs older than a specified number of days,
+    based on the AUTO_DELETE_ERROR_LOGS_ENABLED and AUTO_DELETE_ERROR_LOGS_DAYS settings.
+    """
+    if not settings.AUTO_DELETE_ERROR_LOGS_ENABLED:
+        logger.info("Auto-deletion of error logs is disabled. Skipping.")
+        return
+
+    days_to_keep = settings.AUTO_DELETE_ERROR_LOGS_DAYS
+    if not isinstance(days_to_keep, int) or days_to_keep <= 0:
+        logger.error(
+            f"Invalid AUTO_DELETE_ERROR_LOGS_DAYS value: {days_to_keep}. Must be a positive integer. Skipping deletion."
+        )
+        return
+
+    cutoff_date = datetime.now(timezone.utc) - timedelta(days=days_to_keep)
+
+    logger.info(
+        f"Attempting to delete error logs older than {days_to_keep} days (before {cutoff_date.strftime('%Y-%m-%d %H:%M:%S %Z')})."
+    )
+
+    try:
+        if not database.is_connected:
+            await database.connect()
+            logger.info("Database connection established for deleting error logs.")
+
+        # First, count how many logs will be deleted (optional, for logging)
+        count_query = select(func.count(ErrorLog.id)).where(
+            ErrorLog.request_time < cutoff_date
+        )
+        num_logs_to_delete = await database.fetch_val(count_query)
+
+        if num_logs_to_delete == 0:
+            logger.info(
+                "No error logs found older than the specified period. No deletion needed."
+            )
+            return
+
+        logger.info(f"Found {num_logs_to_delete} error logs to delete.")
+
+        # Perform the deletion
+        query = delete(ErrorLog).where(ErrorLog.request_time < cutoff_date)
+        await database.execute(query)
+        logger.info(
+            f"Successfully deleted {num_logs_to_delete} error logs older than {days_to_keep} days."
+        )
+
+    except Exception as e:
+        logger.error(
+            f"Error during automatic deletion of error logs: {e}", exc_info=True
+        )
+
+
+async def process_get_error_logs(
+    limit: int,
+    offset: int,
+    key_search: Optional[str],
+    error_search: Optional[str],
+    error_code_search: Optional[str],
+    start_date: Optional[datetime],
+    end_date: Optional[datetime],
+    sort_by: str,
+    sort_order: str,
+) -> Dict[str, Any]:
+    """
+    处理错误日志的检索，支持分页和过滤。
+    """
+    try:
+        logs_data = await db_services.get_error_logs(
+            limit=limit,
+            offset=offset,
+            key_search=key_search,
+            error_search=error_search,
+            error_code_search=error_code_search,
+            start_date=start_date,
+            end_date=end_date,
+            sort_by=sort_by,
+            sort_order=sort_order,
+        )
+        total_count = await db_services.get_error_logs_count(
+            key_search=key_search,
+            error_search=error_search,
+            error_code_search=error_code_search,
+            start_date=start_date,
+            end_date=end_date,
+        )
+        return {"logs": logs_data, "total": total_count}
+    except Exception as e:
+        logger.error(f"Service error in process_get_error_logs: {e}", exc_info=True)
+        raise
+
+
+async def process_get_error_log_details(log_id: int) -> Optional[Dict[str, Any]]:
+    """
+    处理特定错误日志详细信息的检索。
+    如果未找到，则返回 None。
+    """
+    try:
+        log_details = await db_services.get_error_log_details(log_id=log_id)
+        return log_details
+    except Exception as e:
+        logger.error(
+            f"Service error in process_get_error_log_details for ID {log_id}: {e}",
+            exc_info=True,
+        )
+        raise
+
+
+async def process_delete_error_logs_by_ids(log_ids: List[int]) -> int:
+    """
+    按 ID 批量删除错误日志。
+    返回尝试删除的日志数量。
+    """
+    if not log_ids:
+        return 0
+    try:
+        deleted_count = await db_services.delete_error_logs_by_ids(log_ids)
+        return deleted_count
+    except Exception as e:
+        logger.error(
+            f"Service error in process_delete_error_logs_by_ids for IDs {log_ids}: {e}",
+            exc_info=True,
+        )
+        raise
+
+
+async def process_delete_error_log_by_id(log_id: int) -> bool:
+    """
+    按 ID 删除单个错误日志。
+    如果删除成功（或找到日志并尝试删除），则返回 True，否则返回 False。
+    """
+    try:
+        success = await db_services.delete_error_log_by_id(log_id)
+        return success
+    except Exception as e:
+        logger.error(
+            f"Service error in process_delete_error_log_by_id for ID {log_id}: {e}",
+            exc_info=True,
+        )
+        raise