Moved airgap detection test from integration tests to airgap module

[Lionqueen94]

Closes #2628

[github-actions]

Sigrid maintainability feedback

✅ You wrote maintainable code and achieved your objective of 3.5 stars.

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Sigrid compared your code against the baseline of 2026-01-06.

👍 What went well?

You fixed or improved 0 refactoring candidates.

👎 What could be better?

You did not introduce any technical debt during your changes, great job!

📚 Remaining technical debt

7 refactoring candidates didn't get better or worse, but are still present in the code you touched.

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⭐️ Sigrid ratings

System property	System on 2026-01-06	Before changes	New/changed code
Volume	3.4	N/A	N/A
Duplication	3.7	5.5	5.5
Unit Size	2.2	1.5	1.5
Unit Complexity	3.2	5.5	5.5
Unit Interfacing	2.9	5.5	5.5
Module Coupling	3.3	N/A	N/A
Component Independence	2.1	N/A	N/A
Component Entanglement	2.3	N/A	N/A
Maintainability	2.9	4.5	4.5

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[github-actions]

PDF Diff Summary

Comparing against base branch: main

File	Status
model-n-10-2.pdf	✅ No changes
model-na-14-2-bijlage1.pdf	✅ No changes
model-na-14-2.pdf	✅ No changes
model-na-31-2-bijlage1.pdf	✅ No changes
model-na-31-2-inlegvel.pdf	✅ No changes
model-na-31-2.pdf	✅ No changes
model-p-2a.pdf	✅ No changes

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.85%. Comparing base (3a04dd3) to head (9994cb8).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/src/airgap/detect.rs	85.18%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2707      +/-   ##
==========================================
- Coverage   91.87%   91.85%   -0.03%     
==========================================
  Files         375      375              
  Lines       18951    18981      +30     
  Branches     1965     1967       +2     
==========================================
+ Hits        17412    17435      +23     
- Misses       1446     1452       +6     
- Partials       93       94       +1     

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