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## What - Add Replicate as a chat provider backed by the documented predictions API - Register Replicate in the Go model factory and provider config - Support non-streaming chat through sync predictions, polling fallback, streaming through `urls.stream`, model listing, and connection checks ## Notes - Uses `POST /v1/predictions` with Replicate model identifiers in `version`, which supports official and community model identifiers - Maps RAGFlow messages into Replicate prompt-shaped inputs (`prompt`, optional `system_prompt`) and forwards common documented LLM inputs: `max_new_tokens`, `temperature`, `top_p` - Preserves whitespace in SSE output chunks and emits RAGFlow `[DONE]` at stream completion ## Tests - `go test -vet=off -run TestReplicate -count=1 ./internal/entity/models` - `go test -vet=off -count=1 ./internal/entity/models` Refs #14736