[AINode] Fix backend auto-selection

[CRZbulabula]

No description provided.

[Copilot]

Pull request overview

This PR adjusts AINode’s device backend auto-selection logic to prefer CUDA when available and adds logging around the chosen backend / fallback behavior.

Changes:

• Restrict auto-selection to try CUDA first, otherwise fall back to CPU.
• Add AINode log statements describing backend selection and fallback.
• Update the DeviceManager docstring to reflect the supported backends.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.88%. Comparing base (599ad8b) to head (fe2c610).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17314      +/-   ##
============================================
- Coverage     39.89%   39.88%   -0.01%     
  Complexity      282      282              
============================================
  Files          5117     5117              
  Lines        344511   344511              
  Branches      43895    43895              
============================================
- Hits         137436   137412      -24     
- Misses       207075   207099      +24     

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