Fix missing R package dependencies in FLoRA pipeline workflow

[Copilot]

The run-flora-pipeline.yml workflow was installing only the packages explicitly called in prepare_flora.qmd, missing all transitive dependencies from the six sourced R helper scripts — causing an immediate failure on library(rcrossref).

Missing packages added to Install R dependencies step

Package	Required by
rcrossref	augmentation.R, crossref_cache.R
readr	openalex_cache.R, unpaywall_cache.R
ellmer	llm_classification.R
openssl	prepare_flora.qmd (openssl::md5())
openxlsx	crossref_cache.R (openxlsx::write.xlsx())
purrr	openalex_cache.R, unpaywall_cache.R, llm_classification.R

- name: Install R dependencies
  run: |
    Rscript -e 'install.packages(c("knitr", "rmarkdown", "dplyr", "stringr", "tibble",
      "readxl", "jsonlite", "glue", "httr", "here", "readr", "rcrossref", "ellmer",
      "openssl", "openxlsx", "purrr"), repos = "https://cloud.r-project.org")'

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