Update process memory metrics to report OS resident memory

[HTHou]

Summary

• change ProcessMetrics#getProcessUsedMemory to report process resident memory instead of JVM heap usage
• add platform-specific collection for Linux (/proc/<pid>/status), macOS (ps -o rss), and Windows (GetProcessMemoryInfo via JNA)
• keep the existing heap-based value as a fallback when resident memory cannot be collected

Testing

• Not run (not requested)

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot
C Reliability Rating on New Code (required ≥ A)

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.84%. Comparing base (da250b8) to head (fe029a3).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...pache/iotdb/db/service/metrics/ProcessMetrics.java	0.00%	42 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17482      +/-   ##
============================================
- Coverage     39.85%   39.84%   -0.02%     
  Complexity      312      312              
============================================
  Files          5135     5135              
  Lines        346929   346970      +41     
  Branches      44210    44218       +8     
============================================
- Hits         138259   138233      -26     
- Misses       208670   208737      +67     

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