v1.0.0 — first CRAN release

formr 1.0.0

Initial CRAN release. Released alongside formr.org server v1.0.0.
Major version bump tracks the formr v1 RESTful API surface implemented by @timseidel, a new contributor,
stabilising — formr_api_* is now the supported entry point for new
code; the legacy formr_results() / formr_raw_results() ("Classic")
path continues to work but is no longer the recommended starting
point in the vignette.

• Vignette walks through the new multi-credential account page. Server
  v1.0 lets a user hold several labelled OAuth credentials side by
  side (each with its own scopes + run allowlist). On the wire nothing
  changed — formr_store_keys() / formr_api_authenticate() already
  accepted an account parameter that namespaces credentials in the
  keyring. The vignette now nudges users to pass the server-side label
  as account so the local store and the server's credential page line
  up by name.

R CMD check across local R 4.3.3, R-devel (4.7 via r-hub container), GitHub Actions matrix, and Win-builder R-devel + R-release: clean (only the expected "new submission" NOTE).