Fix: one NIC's IP pool shortage depleted IPs of other NICs in a multi-NIC setup.

[weizhoublue]

robot cherry pick PR #4379 from ty-dc,to branch release-v1.0, action https://github.com/spidernet-io/spiderpool/actions/runs/12270989004 , commits f9feb6b

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.45%. Comparing base (9eeb019) to head (970534d).
Report is 2 commits behind head on release-v1.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-v1.0    #4382      +/-   ##
================================================
- Coverage         79.55%   79.45%   -0.10%     
================================================
  Files                51       51              
  Lines              5776     5783       +7     
================================================
  Hits               4595     4595              
- Misses             1016     1024       +8     
+ Partials            165      164       -1     

Flag	Coverage Δ
unittests	79.45% <100.00%> (-0.10%)	⬇️

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Files with missing lines	Coverage Δ
pkg/ippoolmanager/ippool_manager.go	84.61% <100.00%> (-2.03%)	⬇️