docs(install): add Windows BUILD_MONAI command variants

[SID-6921]

Summary

Adds explicit Windows examples for BUILD_MONAI=1 installation commands in the installation docs:

• PowerShell syntax ($env:BUILD_MONAI = "1")
• CMD syntax (set BUILD_MONAI=1)

Why

Current docs show POSIX-style env var assignment only, which does not work out-of-the-box on Windows shells. This update documents equivalent commands for Windows users.

Scope

• docs/source/installation.md
• Covers both GitHub install and editable install flows

Closes #6119

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 5c01597b-cf09-4bbd-a0bc-cb9367b6d59a

📥 Commits

Reviewing files that changed from the base of the PR and between 1de4810 and 6e895fa.

📒 Files selected for processing (1)

• docs/source/installation.md

✅ Files skipped from review due to trivial changes (1)

• docs/source/installation.md

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📝 Walkthrough

Walkthrough

Adds Windows-specific installation instructions to docs/source/installation.md. Under "Option 1", new PowerShell and bat code blocks show how to set BUILD_MONAI=1 before running pip install and the --no-build-isolation variant. Under "Option 2 (editable installation)", matching Windows blocks are added for the editable install workflow.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the doc change and highlights the Windows BUILD_MONAI install variants.
Description check	✅ Passed	The description includes summary, rationale, scope, and issue closure, with only noncritical template items omitted.
Linked Issues check	✅ Passed	The docs update provides Windows CMD and PowerShell BUILD_MONAI instructions for both install flows, matching #6119.
Out of Scope Changes check	✅ Passed	The change is limited to installation documentation and stays within the requested Windows instructions scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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