feat: claude web search tool 计费

relay/channel/claude/relay-claude.go

@@ -745,6 +745,10 @@ func HandleClaudeResponseData(c *gin.Context, info *relaycommon.RelayInfo, claud
 		responseData = data
 	}
 
+	if claudeResponse.Usage.ServerToolUse != nil && claudeResponse.Usage.ServerToolUse.WebSearchRequests > 0 {
+		c.Set("claude_web_search_requests", claudeResponse.Usage.ServerToolUse.WebSearchRequests)
+	}
+
 	common.IOCopyBytesGracefully(c, nil, responseData)
 	return nil
 }