fix: update default task log path for consistency across environments

- Changed the default task log path from '/var/log/crawlab/tasks' to '/app/logs/tasks' to align with the application's directory structure and improve portability in different deployment environments.

core/utils/config.go

@@ -11,7 +11,7 @@ import (
 
 const (
 	DefaultWorkspace           = "crawlab_workspace"
-	DefaultTaskLogPath         = "/var/log/crawlab/tasks"
+	DefaultTaskLogPath         = "/app/logs/tasks"
 	DefaultServerHost          = "0.0.0.0"
 	DefaultServerPort          = 8000
 	DefaultGrpcHost            = "localhost"