Prepare rvinecopulib 1.0.0.1.0 metadata

[tnagler]

Summary

• bump the R package version to 1.0.0.1.0
• retain the version convention: the first three components identify the bundled vinecopulib 1.0.0 backend, and the final two are frontend minor/patch indicators
• replace the provisional release notes with a consolidated backend-style NEWS entry
• document breaking requirements, behavior changes, frontend features, performance work, bug fixes, and build/import changes
• link to the complete backend 1.0.0 NEWS while intentionally omitting backend-only persistence features such as CBOR from the R package feature list

API and release decisions

• this PR contains release metadata only; the public APIs are introduced and reviewed in the lower stack layers
• the release is marked unreleased until the stack is approved and finalized
• the package declares R >= 4.0.0, C++17, and BH >= 1.75.0-0
• DESCRIPTION identifies the bundled C++ backend as vinecopulib 1.0.0

Tests

Validation at the full stack tip, including the final backend refresh to vinecopulib@4efce25966871a09f71891183b57082ff5e080e1:

• complete testthat suite: 817 passed, 0 failures, warnings, or skips
• R CMD build --no-build-vignettes: built rvinecopulib_1.0.0.1.0.tar.gz
• R CMD check --no-manual --no-build-vignettes: Status: OK
• check confirmed package version 1.0.0.1.0, C++17 compilation, S3 consistency, documentation consistency, examples, and tests

This is the top layer of GitHub stack #330 and should be merged only after the feature layers below it.