chore: migrate monorepo toolchain pnpm+vitest → bun (bun test, bunfig preload, bun.lock)
- Gateway + backend + frontend: pnpm/vitest fully removed → bun 1.3.14
(bun install, bun test tests/, bunfig.toml [test] preload, bun.lock).
- vitest configs deleted; vitest→bun facade (jest/mock/spyOn/waitForCompat)
keeps the vitest-style assertions working under bun:test.
- flake.nix: bunInstall switch; pruned prod-pass now removes post-pnpm
dev-toolchain trees; frontend builds Next standalone via bun's next.
- CI: deploy.yml installs with bun + runs bun test tests/ per service.
- 190 tests green (146 gateway + 37 backend pass, 14 skip), 0 fail;
tsc + biome across all 3 services clean.
Co-authored-by: git-migration[bot] <noreply@gmw.local>