fix(backend): include full error chain in stream IO errors

[gaius-qi]

Description

This pull request updates the workspace version to 1.3.7 and improves error handling in HTTP response reading for multiple backends. The main changes are upgrading internal dependencies to the new version and enhancing error reporting by including chained error messages, which should make debugging easier.

Dependency version updates:

• Updated the workspace version and all internal dragonfly-client-* dependencies from 1.3.6 to 1.3.7 in Cargo.toml. [1] [2]

Error handling improvements:

• In dragonfly-client-backend/src/http.rs, hugging_face.rs, and model_scope.rs, improved error reporting in the response stream reader by chaining error messages from all underlying sources, making errors more descriptive and easier to trace. [1] [2] [3] [4] [5] [6]

Related Issue

Motivation and Context

Screenshots (if appropriate)

[chlins]

lgtm

[codecov]

Codecov Report

❌ Patch coverage is 0% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.43%. Comparing base (9926bfe) to head (4aab435).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client-backend/src/hugging_face.rs	0.00%	13 Missing ⚠️
dragonfly-client-backend/src/model_scope.rs	0.00%	13 Missing ⚠️
dragonfly-client-backend/src/http.rs	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1806      +/-   ##
==========================================
- Coverage   43.44%   43.43%   -0.02%     
==========================================
  Files          92       92              
  Lines       26972    26997      +25     
==========================================
+ Hits        11719    11726       +7     
- Misses      15253    15271      +18     

Files with missing lines	Coverage Δ
dragonfly-client-backend/src/http.rs	96.07% <0.00%> (-1.05%)	⬇️
dragonfly-client-backend/src/hugging_face.rs	35.04% <0.00%> (-0.46%)	⬇️
dragonfly-client-backend/src/model_scope.rs	42.21% <0.00%> (-0.52%)	⬇️

... and 1 file with indirect coverage changes

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