feat: support web search for zhipu via web_search_options

relay/channel/zhipu_4v/adaptor.go

@@ -90,7 +90,7 @@ func (a *Adaptor) ConvertOpenAIRequest(c *gin.Context, info *relaycommon.RelayIn
 	if lo.FromPtrOr(request.TopP, 0) >= 1 {
 		request.TopP = lo.ToPtr(0.99)
 	}
-	return requestOpenAI2Zhipu(*request), nil
+	return injectZhipuWebSearch(requestOpenAI2Zhipu(*request), request.WebSearchOptions), nil
 }
 
 func (a *Adaptor) ConvertRerankRequest(c *gin.Context, relayMode int, request dto.RerankRequest) (any, error) {

relay/channel/zhipu_4v/relay-zhipu_v4.go

@@ -58,3 +58,25 @@ func requestOpenAI2Zhipu(request dto.GeneralOpenAIRequest) *dto.GeneralOpenAIReq
 	}
 	return out
 }
+
+func injectZhipuWebSearch(req *dto.GeneralOpenAIRequest, opts *dto.WebSearchOptions) any {
+	if opts == nil {
+		return req
+	}
+	ws := map[string]any{
+		"enable":        true,
+		"search_engine": "search_pro_jina",
+	}
+	// medium 不显式设值，使用智谱上游默认。
+	switch opts.SearchContextSize {
+	case "low":
+		ws["count"] = 5
+	case "high":
+		ws["count"] = 15
+		ws["content_size"] = "high"
+	}
+	m := req.ToMap()
+	tools, _ := m["tools"].([]any)
+	m["tools"] = append(tools, map[string]any{"type": "web_search", "web_search": ws})
+	return m
+}