[feat] ai-security-guard refactor & support checking multimoadl input

[rinfx]

Ⅰ. Describe what this PR did

1. 对代码进行重构，进行了模块化拆分，以适应从文本处理到多模态处理的转变
2. 文本生成场景支持多模态输入检测

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

---

Ⅰ. Describe what this PR did

1. The code was restructured and modularized to adapt to the transition from text processing to multi-modal processing.
2. Text generation scenarios support multi-modal input detection

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 36.90338% with 542 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.05%. Comparing base (ef31e09) to head (e944ba8).
⚠️ Report is 770 commits behind head on main.

Files with missing lines	Patch %	Lines
...ai-security-guard/lvwang/common/text_generation.go	5.35%	157 Missing and 2 partials ⚠️
...-guard/lvwang/multi_modal_guard/text_generation.go	0.00%	139 Missing ⚠️
...m-go/extensions/ai-security-guard/config/config.go	51.81%	112 Missing and 21 partials ⚠️
...ai-security-guard/lvwang/common/request_builder.go	71.89%	37 Missing and 6 partials ⚠️
...ard/lvwang/text_moderation_plus/text_generation.go	46.57%	34 Missing and 5 partials ⚠️
...ugins/wasm-go/extensions/ai-security-guard/main.go	36.36%	20 Missing and 1 partial ⚠️
...asm-go/extensions/ai-security-guard/utils/utils.go	52.94%	7 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (36.90%) 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    #3075      +/-   ##
==========================================
+ Coverage   35.91%   43.05%   +7.14%     
==========================================
  Files          69       89      +20     
  Lines       11576    11806     +230     
==========================================
+ Hits         4157     5083     +926     
+ Misses       7104     6358     -746     
- Partials      315      365      +50     

Flag	Coverage Δ
wasm-go-plugin-ai-security-guard	38.24% <36.90%> (?)

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

Files with missing lines	Coverage Δ
...asm-go/extensions/ai-security-guard/utils/utils.go	52.94% <52.94%> (ø)
...ugins/wasm-go/extensions/ai-security-guard/main.go	55.55% <36.36%> (ø)
...ard/lvwang/text_moderation_plus/text_generation.go	46.57% <46.57%> (ø)
...ai-security-guard/lvwang/common/request_builder.go	71.89% <71.89%> (ø)
...m-go/extensions/ai-security-guard/config/config.go	51.81% <51.81%> (ø)
...-guard/lvwang/multi_modal_guard/text_generation.go	0.00% <0.00%> (ø)
...ai-security-guard/lvwang/common/text_generation.go	5.35% <5.35%> (ø)

... and 97 files with indirect coverage changes

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