feat(knowledge): Support ark rerank

[liuyunchao-1998]

What type of PR is this?

Check the PR title.

• This PR title match the format: <type>(optional scope): <description>
• The description of this PR title is user-oriented and clear enough for others to understand.
• Add documentation if the current PR requires user awareness at the usage level.

(Optional) Translate the PR title into Chinese.

支持火山rerank

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en:Support ark rerank
zh(optional): 支持火山rerank

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

[codecov-commenter]

Codecov Report

❌ Patch coverage is 16.90141% with 59 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nd/infra/impl/document/rerank/vikingdb/vikingdb.go	0.00%	25 Missing ⚠️
backend/application/base/appinfra/app_infra.go	0.00%	18 Missing ⚠️
backend/domain/knowledge/service/retrieve.go	42.85%	15 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
backend/domain/knowledge/service/retrieve.go	18.04% <42.85%> (+0.96%)	⬆️
backend/application/base/appinfra/app_infra.go	1.55% <0.00%> (-0.06%)	⬇️
...nd/infra/impl/document/rerank/vikingdb/vikingdb.go	0.00% <0.00%> (ø)

... and 6 files with indirect coverage changes

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