Refine REDCap metadata handling and package documentation

[rsh52]

Description

This PR applies the package-wide review findings to simplify the implementation, strengthen REDCap metadata handling, and improve test and documentation coverage.

Proposed Changes

• Refactor codebook construction around focused choice and repeating-instrument helpers.
• Include checkbox, dropdown, radio, yes/no, and true/false fields in codebook choices, with a choice_type column.
• Use REDCapR::redcap_instrument_repeating() as the repeating configuration source and align the codebook repeating output with REDCapR.
• Move codebook CSS and JavaScript into package assets and cover their rendered contents with snapshots.
• Rename the record-status dataset builder to build_record_status_data() and remove the deprecated compatibility function.
• Simplify quality-report checks, improve realistic edge-case coverage, and refresh mock datasets.
• Add a comprehensive quality-report article and expose it through the pkgdown Articles menu.
• Add GitHub bug, feature, and pull-request templates; configure clean pkgdown deployments so obsolete pages are removed.
• Tighten package imports, lint configuration, generated documentation, and README guidance.

Dependency Notes

• Require the development version of REDCapR that provides redcap_instrument_repeating().
• Require dplyr >= 1.1.0 for cross_join().
• Move tidyr from Imports to Suggests because it is only used in tests.

Validation

• devtools::test(reporter = "summary")
• lintr::lint_package()
• air format --check .
• Full pkgdown site build, including articles/quality-report.html
• git diff --check

Review Notes

The codebook output shape changes intentionally:

• choices gains choice_type and includes implicit yes/no and true/false choices.
• repeating removes the redundant redcap_event_name column and follows REDCapR::redcap_instrument_repeating()$data.

No issue is linked to this review-driven change.