[bugfix] add claude usage & bedrock tool_call index

[rinfx]

Change-Id: I9640b29442d881abd31d55ee2c1c761deceeec1d
Co-developed-by: Cursor [email protected]

Ⅰ. Describe what this PR did

1. 修复claude2openai转换中usage信息丢失问题
2. bedrock 流式工具响应添加index字段

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.97%. Comparing base (ef31e09) to head (8bb32b1).
⚠️ Report is 774 commits behind head on main.

Files with missing lines	Patch %	Lines
...o/extensions/ai-proxy/provider/claude_to_openai.go	0.00%	8 Missing ⚠️
...ns/wasm-go/extensions/ai-proxy/provider/bedrock.go	0.00%	5 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3095       +/-   ##
===========================================
+ Coverage   35.91%   45.97%   +10.05%     
===========================================
  Files          69      137       +68     
  Lines       11576    20757     +9181     
===========================================
+ Hits         4157     9542     +5385     
- Misses       7104    10738     +3634     
- Partials      315      477      +162     

Flag	Coverage Δ
wasm-go-plugin-ai-proxy	48.77% <0.00%> (?)

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

Files with missing lines	Coverage Δ
...ns/wasm-go/extensions/ai-proxy/provider/bedrock.go	0.00% <0.00%> (ø)
...o/extensions/ai-proxy/provider/claude_to_openai.go	30.75% <0.00%> (ø)

... and 150 files with indirect coverage changes

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