[fix][backend]Fix the issue where requesting the Azure API returns a 404 error

[yyyhhl]

What type of PR is this?

fix: A bug fix

Check the PR title.

Fix the issue where requesting the Azure API returns a 404 error

(Optional) Translate the PR title into Chinese.

修复请求azure api会报错404的问题

(Optional) Which issue(s) this PR fixes:

Fixes #189

[CozeLoop]

Reviewed the PR focusing strictly on modified backend files, excluding generated and frontend paths per scope. The changes address two issues:

1. entity/manage.go: Align JSON/YAML/mapstructure tags for ProtocolConfigOpenAI from "protocol_config_open_ai" to "protocol_config_openai" to match IDL/config usage. This eliminates config unmarshalling mismatches and is consistent across the repo.

2. eino/init.go (openAIBuilder): Scope the cfg.ResponseFormat assignment within the non-empty ResponseFormatJsonSchema branch. This prevents setting a response format with an empty schema, which can cause Azure OpenAI endpoints to reject requests (observed 404). The current logic sets ResponseFormat only when schema is present; otherwise, respects defaults.

No correctness, concurrency, performance, or security issues were found on the changed lines. Backward compatibility risk appears low since examples and IDL already use "protocol_config_openai"; if any external configs still use the deprecated "open_ai" key, they will need to migrate. Suggest adding a brief release note.

Approved.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nd/modules/llm/domain/service/llmimpl/eino/init.go	80.00%	0 Missing and 1 partial ⚠️

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   58.80%   58.81%   +0.01%     
==========================================
  Files         512      512              
  Lines       53303    53303              
==========================================
+ Hits        31345    31352       +7     
+ Misses      19576    19570       -6     
+ Partials     2382     2381       -1     

Flag	Coverage Δ
unittests	58.81% <80.00%> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
backend/modules/llm/domain/entity/manage.go	84.96% <ø> (ø)
...nd/modules/llm/domain/service/llmimpl/eino/init.go	56.98% <80.00%> (+0.26%)	⬆️

... and 1 file with indirect coverage changes

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