Try adding pattern to replications targets

[psychelzh]

This is used to fix #3.

[Copilot]

Pull Request Overview

This PR refactors the permutation testing infrastructure to support pattern-based replication, addressing issue #3. The changes migrate from using tarchetypes::tar_rep_raw() to a custom pattern-based approach for better integration with the targets workflow.

• Adds pattern support to tar_cluster_permutation() and tar_mantel() functions
• Replaces batch-based permutation with a custom run_rep_df() function that generates replications as list columns
• Updates target calls to use the new pattern-based approach with increased default replications (1000 vs previous 10)

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
_targets.R	Adds pattern and iteration parameters to specific targets using the new replication system
R/tar_factories.R	Major refactor of permutation functions to support pattern-based replication with new run_rep_df() helper
R/clusters.R	Updates default column identifier for permuted data from starts_with("tar") to .rep

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[psychelzh]

In fact, I must use "list" iteration in some places, which adds complexity to the issue. So, we might suspend this case for now.