2. 用户 patch (cordis.patch.yml) 提供后端链配置:

配置 (cordis.patch.yml)

- id: search-pool
  name: dsh-search-failover
  config:
    strategy: failover          # failover | rotate
    maxResults: 8
    timeoutMs: 15000
    backends:
      - id: exa                 # 主力 (需 key)
        kind: exa
        apiKeyEnv: EXA_API_KEY
        priority: 1
      - id: serper              # 2500 次试用 (需 key)
        kind: serper
        apiKeyEnv: SERPER_API_KEY
        priority: 2
      - id: tavily-anon         # 无 key → Tavily keyless 匿名档
        kind: tavily
        priority: 3
      - id: jina                # 免费注册 key 后可用
        kind: jina
        apiKeyEnv: JINA_API_KEY
        priority: 4
      - id: ddg                 # DuckDuckGo HTML, 完全免费 (可能被反爬拦截)
        kind: ddg
        priority: 5
      - id: serpapi             # 250 次/月 (需 key)
        kind: serpapi
        apiKeyEnv: SERPAPI_API_KEY
        priority: 6
      - id: brave               # 2000 次/月 (需 key)
        kind: brave
        apiKeyEnv: BRAVE_API_KEY
        priority: 7
      - id: searxng             # 自托管 (可选)
        kind: searxng
        baseURL: http://localhost:8080
        priority: 8
    circuit:
      threshold: 3
      burstWindowMs: 300000
      cooldownMs: 60000
      quotaCooldownMs: 3600000