BitToby bd4ce39038 Go: implement provider: Perplexity (#15008) ...

## What
- Add Perplexity as a chat and embedding provider backed by its
OpenAI-compatible `/chat/completions` and `/v1/embeddings` APIs
- Register Perplexity in the Go model factory and provider config
- Support non-streaming chat, SSE streaming chat, embeddings, model
listing, and connection checks

Refs #14736

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Co-authored-by: Jin Hai <haijin.chn@gmail.com>

2026-05-21 15:33:02 +08:00

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