Add a named OrcaRouterEmbedder mirroring the existing OpenRouterEmbedder: a production AI gateway that proxies 200+ models on one OpenAI-compatible endpoint (https://api.orcarouter.ai/v1). Selecting it is a one-line switch: set ORCAROUTER_API_KEY instead of OPENROUTER_API_KEY. - get_embedder() prefers OrcaRouter when ORCAROUTER_API_KEY is present - is_semantic_search_available() now also enables on OrcaRouter keys - document the new option in README (Alternatif 3) and .env.example Co-Authored-By: Claude <noreply@anthropic.com> Signed-off-by: jinhao.song <jinhao.song@myflashcloud.com>