Adds bun.lock alongside the existing package-lock.json for:
studio/ (Tauri CLI holder, 13 pkgs)
studio/backend/core/data_recipe/oxc-validator/ (49 pkgs)
studio/frontend/ (1090 pkgs)
Generated with `bun install --lockfile-only --save-text-lockfile`
against Bun 1.3.11. Each lockfile carries sha512 integrity entries
and full platform-conditional optionalDependencies coverage for
linux/darwin/win32 x64/arm64/musl variants.
Updates .gitignore to mirror the existing package-lock.json opt-in
pattern: a top-level `bun.lock` ignore with negations for the three
surfaces, plus removal of the legacy `bun.lock` entry in
studio/frontend/.gitignore.
This unlocks `bun install --frozen-lockfile` as the fast path in
setup.sh / setup.ps1 / build.sh (follow-up commit).
