refactor: improve AI response content handling

[tangcent]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 44.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 53.463%. Comparing base (bf7aba1) to head (9633208).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...gcent/idea/plugin/api/infer/AIMethodInferHelper.kt	0.000%	6 Missing ⚠️
...gin/api/export/translation/APITranslationHelper.kt	0.000%	4 Missing ⚠️
...rc/main/kotlin/com/itangcent/ai/DeepSeekService.kt	0.000%	1 Missing ⚠️
...src/main/kotlin/com/itangcent/ai/LocalLLMClient.kt	0.000%	1 Missing ⚠️
.../src/main/kotlin/com/itangcent/ai/OpenAIService.kt	0.000%	1 Missing ⚠️
.../kotlin/com/itangcent/idea/plugin/utils/AIUtils.kt	91.667%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #1214       +/-   ##
===============================================
+ Coverage     53.435%   53.463%   +0.029%     
- Complexity      2708      2715        +7     
===============================================
  Files            284       284               
  Lines          15984     15996       +12     
  Branches        3580      3583        +3     
===============================================
+ Hits            8541      8552       +11     
  Misses          5802      5802               
- Partials        1641      1642        +1     

Flag	Coverage Δ
unittests	53.463% <44.000%> (+0.029%)	⬆️

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

Files with missing lines	Coverage Δ
...rc/main/kotlin/com/itangcent/ai/DeepSeekService.kt	2.564% <0.000%> (+0.064%)	⬆️
...src/main/kotlin/com/itangcent/ai/LocalLLMClient.kt	0.000% <0.000%> (ø)
.../src/main/kotlin/com/itangcent/ai/OpenAIService.kt	7.143% <0.000%> (+0.246%)	⬆️
.../kotlin/com/itangcent/idea/plugin/utils/AIUtils.kt	88.889% <91.667%> (+5.556%)	⬆️
...gin/api/export/translation/APITranslationHelper.kt	0.000% <0.000%> (ø)
...gcent/idea/plugin/api/infer/AIMethodInferHelper.kt	10.924% <0.000%> (-0.093%)	⬇️

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