DeepSeek Search API (POST /v1/tools/search) as a Perplexed.Search provider.
Each result carries a 600 to 800 character summary written for a model to
read, which becomes the hit's description. need_content: true (the
default here) also returns available page text at no extra cost. Queries
are capped at 128 characters. Billed $0.75 per 1,000 successful requests;
empty results are not billed. Searches are processed by DeepSeek.
Needs config :perplexed, deepseek_api_key:.