[XPU]MAX_BSZ aligns gpu settings and disable prefix cache in OCR VL

[ddchenhao66]

Motivation

1. xpu的MAX_BSZ设置对齐GPU，修复max_num_seqs=256服务报错
2. xpu 在OCR VL模型默认关闭prefix cache

Modifications

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.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@a8d3e3b). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
fastdeploy/worker/worker_process.py	0.00%	2 Missing and 1 partial ⚠️
fastdeploy/engine/args_utils.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #5831   +/-   ##
==========================================
  Coverage           ?   66.67%           
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  Files              ?      346           
  Lines              ?    44325           
  Branches           ?     6814           
==========================================
  Hits               ?    29555           
  Misses             ?    12586           
  Partials           ?     2184           

Flag	Coverage Δ
GPU	66.67% <28.57%> (?)

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[EmmonsCurse]

LGTM～

[paddle-bot]

Thanks for your contribution!