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/monitor.go

@@ -0,0 +1,36 @@
+package rcs
+
+import (
+	"fmt"
+
+	"github.com/XingfenD/rainyun_api_go_sdk/apis/common"
+	"github.com/XingfenD/rainyun_api_go_sdk/constant"
+)
+
+type GetRcsMonitorDataRequest struct {
+	StartDate int `json:"start_date"` // 开始时间(时间戳)
+	EndDate   int `json:"end_date"`   // 结束时间(时间戳)
+}
+
+type GetRcsMonitorDataResponse struct {
+	Code int            `json:"code"`
+	Data RcsMonitorData `json:"data"`
+}
+
+// RcsMonitorData 监控数据, Columns 与 Values 一一对应
+type RcsMonitorData struct {
+	Columns []string    `json:"Columns"`
+	Values  [][]float64 `json:"Values"`
+}
+
+func (s *RcsService) GetRcsMonitorData(id int, req *GetRcsMonitorDataRequest) (*GetRcsMonitorDataResponse, error) {
+	path := fmt.Sprintf("/product/rcs/%d/monitor", id)
+
+	var resp GetRcsMonitorDataResponse
+	querys, err := common.MarshalQueryParams(req)
+	if err != nil {
+		return nil, err
+	}
+	err = s.client.Do(constant.HTTPMethod_GET, path, querys, nil, &resp)
+	return &resp, err
+}