feat: sonic convert and convert error handler

[zijiren233]

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[Copilot]

Pull request overview

This PR expands rerank conversion support for multimodal content, adds new rerank models, and standardizes several request-conversion errors into relay errors.

Changes:

• Adds Sonic AST-based rerank conversion/usage handling for Ali, OpenAI-compatible, and native video request paths.
• Adds convert-request error helpers across multiple adaptors and updates image/video/STT/chat/embedding conversion error paths.
• Adds tests for multimodal rerank conversion and relay-error behavior, and increases rerank timeout.

Reviewed changes

Copilot reviewed 33 out of 33 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
core/relay/plugin/timeout/timeout.go	Extends rerank request timeout.
core/relay/controller/rerank.go	Reworks rerank usage parsing with Sonic AST and multimodal text counting.
core/relay/controller/rerank_test.go	Adds rerank usage tests for string and multimodal requests.
core/relay/adaptor/text-embeddings-inference/rerank.go	Wraps rerank conversion validation errors as relay errors.
core/relay/adaptor/text-embeddings-inference/rerank_test.go	Verifies missing-documents error status.
core/relay/adaptor/siliconflow/video.go	Passes metadata through multipart image validation for relay errors.
core/relay/adaptor/siliconflow/error.go	Adds SiliconFlow convert-request error helper.
core/relay/adaptor/openai/video.go	Wraps multipart parse failures as relay errors.
core/relay/adaptor/openai/stt.go	Wraps STT multipart parse failures as relay errors.
core/relay/adaptor/openai/rerank.go	Adds multimodal rerank content normalization.
core/relay/adaptor/openai/rerank_test.go	Adds OpenAI-compatible rerank normalization tests.
core/relay/adaptor/openai/image.go	Wraps image request parse/validation errors as relay errors.
core/relay/adaptor/openai/error.go	Adds OpenAI convert-request error helper.
core/relay/adaptor/openai/embeddings.go	Wraps embedding JSON parse failures as relay errors.
core/relay/adaptor/openai/chat.go	Wraps chat conversion callback/stream-option errors as relay errors.
core/relay/adaptor/jina/constants.go	Registers the Jina multimodal reranker model.
core/relay/adaptor/gemini/video.go	Wraps Gemini video conversion validation errors as relay errors.
core/relay/adaptor/gemini/video_test.go	Adds Gemini video missing-prompt relay-error test.
core/relay/adaptor/gemini/image.go	Wraps Gemini image/edit validation errors as relay errors.
core/relay/adaptor/gemini/image_test.go	Adds Gemini image missing-prompt relay-error test.
core/relay/adaptor/gemini/error.go	Adds Gemini convert-request error helper.
core/relay/adaptor/doubao/video.go	Wraps Doubao video parse/validation failures as relay errors.
core/relay/adaptor/doubao/main_test.go	Adds Doubao video missing-content relay-error test.
core/relay/adaptor/doubao/error.go	Adds Doubao convert-request error helper.
core/relay/adaptor/doubao/doubao_video.go	Converts native Doubao video requests with Sonic AST.
core/relay/adaptor/ali/video.go	Wraps Ali video parse/validation failures as relay errors.
core/relay/adaptor/ali/rerank.go	Reworks Ali rerank conversion with Sonic AST and multimodal normalization.
core/relay/adaptor/ali/rerank_test.go	Adds Ali rerank Sonic/multimodal/image validation tests.
core/relay/adaptor/ali/image.go	Wraps Ali image/edit validation failures as relay errors.
core/relay/adaptor/ali/error.go	Adds Ali convert-request error helper.
core/relay/adaptor/ali/constants.go	Registers additional Ali rerank models.
core/relay/adaptor/ali/ali_video.go	Converts native Ali video requests with Sonic AST.
core/relay/adaptor/ali/adaptor_test.go	Adds Ali video invalid-variant relay-error test.

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