fix: bufio scanner token too long

[CeerDecy]

What this PR does / why we need it:

fix bufio scanner token too long

the ocr mcp server returns too long in one line

Which issue(s) this PR fixes:

• Fixes #your-issue_number
• [Erda Cloud Issue Link](paste your link here)

Specified Reviewers:

/assign @sfwn

ChangeLog

Language	Changelog
🇺🇸 English	fix bufio scanner token too long
🇨🇳 中文	修复scanner max token size太小导致ocr mcp卡住

Need cherry-pick to release versions?

Add comment like /cherry-pick release/1.0 when this PR is merged.

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[sfwn]

/approve

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 14.24%. Comparing base (6068b45) to head (ddadb34).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...rnal/apps/ai-proxy/providers/mcp-proxy/provider.go	0.00%	4 Missing ⚠️
...s/request/set-resp-body-chunk-splitter/splitter.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6613      +/-   ##
==========================================
+ Coverage   14.19%   14.24%   +0.05%     
==========================================
  Files        3849     3862      +13     
  Lines      385412   386300     +888     
==========================================
+ Hits        54699    55043     +344     
- Misses     325393   325905     +512     
- Partials     5320     5352      +32     

Flag	Coverage Δ
by-github-actions	14.24% <0.00%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...s/request/set-resp-body-chunk-splitter/splitter.go	0.00% <0.00%> (ø)
...rnal/apps/ai-proxy/providers/mcp-proxy/provider.go	0.00% <0.00%> (ø)

... and 24 files with indirect coverage changes

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