#1151: fix arm architecture detection

[shodiBoy1]

This PR fixes #1151

Implemented changes:

• GraalVM native image bakes System.getProperty("os.arch") at compile time, which can report wrong architecture if the binary runs on a different CPU than it was compiled on
• On Mac/Linux, the fix calls uname -m at runtime to detect the actual CPU architecture instead of relying on the baked value
• On Windows, falls back to os.arch since uname is not available
• Updated test to not compare against os.arch directly, since uname -m can return different but equivalent names (e.g. x86_64 vs amd64)

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Checklist for this PR

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled
  with internal

[coveralls]

Pull Request Test Coverage Report for Build 23639809731

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.02%) to 70.443%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/os/SystemInfoImpl.java	1	90.24%

Totals
Change from base Build 23639744235:	0.02%
Covered Lines:	10795
Relevant Lines:	14717

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💛 - Coveralls

[hohwille]

@shodiBoy1 thanks for your PR and taking care of this neglected bug issue. 👍
Your solution/workaround seems fine to me and should work.
I also tested it in Ubuntu.
I left a small review comment at your test changes that I did not understand.
Please have a look. When resolved, we can merge.