feat: update claude tools calling

relay/channel/claude/dto.go

@@ -31,9 +31,9 @@ type ClaudeMessage struct {
 }
 
 type Tool struct {
-	Name        string      `json:"name"`
-	Description string      `json:"description,omitempty"`
-	InputSchema InputSchema `json:"input_schema"`
+	Name        string                 `json:"name"`
+	Description string                 `json:"description,omitempty"`
+	InputSchema map[string]interface{} `json:"input_schema"`
 }
 
 type InputSchema struct {