[BugFix]Set default OMP_NUM_THREADS=3 and fix extra GPU memory usage in DeepSeek

[bukejiyu]

Motivation

Modifications

1.OMP_NUM_THREADS默认设置成3
2.修复deepseek额外占用显存的情况
3.修复qwen2-7B qkv bias未正确loaidng

Usage or Command

Accuracy Tests

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
  • You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[paddle-bot]

Thanks for your contribution!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@b9bdf82). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
fastdeploy/model_executor/layers/utils.py	33.33%	1 Missing and 1 partial ⚠️
fastdeploy/model_executor/layers/linear.py	50.00%	1 Missing ⚠️
fastdeploy/model_executor/utils.py	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #5219   +/-   ##
==========================================
  Coverage           ?   59.67%           
==========================================
  Files              ?      320           
  Lines              ?    39056           
  Branches           ?     5872           
==========================================
  Hits               ?    23308           
  Misses             ?    13902           
  Partials           ?     1846           

Flag	Coverage Δ
GPU	59.67% <66.66%> (?)

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