Add monitoring service and database schema

- Implement monitoring service with heartbeat, lease tasks, resume tasks, and task result handling.
- Create monitoring time utilities for business date calculations.
- Add unit tests for date window resolution and business day handling.
- Define database schema for monitoring-related tables including quotas, daily reports, and task management.
- Establish migration scripts for creating and dropping monitoring tables.

server/internal/shared/middleware/logger.go

@@ -31,6 +31,9 @@ func Logger(logger *zap.Logger) gin.HandlerFunc {
 			if appErr.Detail != "" {
 				fields = append(fields, zap.String("app_detail", appErr.Detail))
 			}
+			if appErr.Cause != nil {
+				fields = append(fields, zap.Error(appErr.Cause))
+			}
 		} else if len(c.Errors) > 0 {
 			fields = append(fields, zap.String("error", c.Errors.String()))
 		}