Enable thin LTO for release builds (#91343)
# What
Add `lto = "thin"` to the workspace-level `[profile.release]` in
`Cargo.toml`.
# Why
Thin LTO enables cross-crate optimization at link time, improving
runtime
performance of the final artifacts (next-napi-bindings native module,
turbopack-cli binary, and benchmarks) without the full build time cost
of
fat LTO.
# How
Added `lto = "thin"` to the workspace root `[profile.release]` section.
This applies to all release-profile link targets in the workspace,
including
binaries, cdylibs, and benchmarks. The `release-with-assertions` and
`release-with-debug` profiles inherit from `release`, so they also
benefit.
