feat(rcs): migrate all RCS APIs from rainyun-go-sdk

- 35 endpoints across 14 files, response structs split for reuse
- Reuse RcsRecord/Node/Plan/OsInfo/UsageData across list/detail/create
- Fix source bugs: {id} path placeholders, missing / in firewall pos path,
  missing body in ChargeRcsTrafic, resp vs &resp
- Add HTTPMethod_PATCH, common.BasicOperationResponse, VncConnectionInfo

apis/rcs/traffic.go

@@ -0,0 +1,33 @@
+package rcs
+
+import (
+	"fmt"
+
+	"github.com/XingfenD/rainyun_api_go_sdk/apis/common"
+	"github.com/XingfenD/rainyun_api_go_sdk/constant"
+)
+
+type ChargeRcsTraficRequest struct {
+	TrafficInGb int `json:"traffic_in_gb"` // 充多少G
+}
+
+type LimitRcsTrafficRequest struct {
+	DayTrafficInGb int `json:"day_traffic_in_gb"` // 日流量阈值(G)
+	TrafficLimit   int `json:"traffic_limit"`     // 限制带宽(M)
+}
+
+func (s *RcsService) ChargeRcsTrafic(id, count int) (*common.BasicOperationResponse, error) {
+	path := fmt.Sprintf("/product/rcs/%d/traffic/charge", id)
+
+	var resp common.BasicOperationResponse
+	err := s.client.Do(constant.HTTPMethod_POST, path, nil, ChargeRcsTraficRequest{TrafficInGb: count}, &resp)
+	return &resp, err
+}
+
+func (s *RcsService) LimitRcsTrafic(id, threshold, limit int) (*common.BasicOperationResponse, error) {
+	path := fmt.Sprintf("/product/rcs/%d/traffic/limit", id)
+
+	var resp common.BasicOperationResponse
+	err := s.client.Do(constant.HTTPMethod_POST, path, nil, LimitRcsTrafficRequest{DayTrafficInGb: threshold, TrafficLimit: limit}, &resp)
+	return &resp, err
+}