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### What problem does this PR solve? Fixes #15012 The Novita Go driver landed in #14850 and shipped a stub `Rerank` method that returned `"novita, no such method"`, so Novita could not be used as a rerank provider in RAGFlow. This PR fills that gap, in the same way #14895 filled the Embed gap on the same driver. Novita exposes a public rerank endpoint at `POST https://api.novita.ai/openai/v1/rerank` that accepts the Cohere-compatible request shape (`{model, query, documents, top_n}`) with `Authorization: Bearer <api_key>`. `baai/bge-reranker-v2-m3` is documented in Novita's model library with a 1024-token limit.