fix(install): enable TBB by default on Linux

[wlgys8]

Summary

• Enable Intel TBB by default in Linux runtime installations for both CUDA and ROCm.
• Include TBB in the full ROCm development installation; retain existing CUDA --all behavior and explicit --tbb compatibility.
• Keep non-Linux runtime defaults unchanged and update the bilingual installation guides and help text.

Fixes #117

Validation

• Passed: prek run --all-files
• Passed: sh -n install.sh
• Passed: git diff --check
• Installer behavior was verified with 13 temporary regression tests, removed before commit as requested.
• Strict Chinese and English Sphinx builds are blocked by unrelated task configs referencing unregistered g1-walk-slope-* environments during environment overview generation.

[Copilot]

🟢 Approval recommended

The installer and docs changes correctly and consistently enable TBB by default on Linux across all sync paths while leaving non-Linux defaults unchanged, with no defects found.

0 open findings

What changed in this PR

This PR resolves issue #117 by making Intel TBB install by default on Linux, so Numba parallel manager kernels use the TBB threading layer (avoiding the OpenMP per-region thread-wakeup overhead on many-core hosts) without requiring the explicit --tbb flag. It fits into the installer bootstrap flow in install.sh and keeps --tbb as a compatibility/opt-in flag for other platforms, updating the bilingual installation guides to match.

Changes:

• Detect Linux in install.sh and set TBB=1, assembling a shared TBB_EXTRA appended to the default sync and the --all ROCm sync (CUDA --all already covers TBB via --all-extras).
• Update the installer header comment and --tbb help text to state TBB is default on Linux.
• Update the English and Chinese installation guides to document the new Linux default and that other platforms are unaffected.

File	Description
install.sh	Adds a Linux case arm setting TBB=1, builds a reusable TBB_EXTRA, and appends it to the ROCm --all and default syncs; updates header comment and help text.
docs/​source/​en/​user_guide/​getting_started/​installation.md	Documents the Linux-default TBB behavior (incl. --all and both GPU profiles) and clarifies the --tbb flag is now explicit/opt-in.
docs/​source/​zh_CN/​user_guide/​getting_started/​installation.md	Mirrors the English doc updates for the Chinese installation guide.

🧠 Review effort: Balanced

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