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/edisk.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 RcsManagesElasticCloudDisksRequest struct {
+	Actions []struct {
+		Type   string `json:"type"`   // 操作类型: expand: 扩容, create: 创建
+		Action any    `json:"action"` // 操作参数, RcsManagesElasticCloudDisksExpand或RcsManagesElasticCloudDisksCreate
+	} `json:"actions"`
+}
+
+type RcsManagesElasticCloudDisksExpand struct {
+	EdiskID  int  `json:"edisk_id"`   // 弹性云盘ID
+	SizeInGb int  `json:"size_in_gb"` // 操作容量
+	Backup   bool `json:"backup"`     // 支持备份
+}
+
+type RcsManagesElasticCloudDisksCreate struct {
+	SizeInGb int    `json:"size_in_gb"` // 操作容量
+	DiskType string `json:"disk_type"`  // 磁盘类型(ssd/hdd)
+	Backup   bool   `json:"backup"`     // 支持备份
+	Tag      string `json:"tag"`        // 标签
+}
+
+func (s *RcsService) RcsManagesElasticCloudDisks(id int, req *RcsManagesElasticCloudDisksRequest) (*common.BasicOperationResponse, error) {
+	path := fmt.Sprintf("/product/rcs/%d/edisk", id)
+
+	var resp common.BasicOperationResponse
+	err := s.client.Do(constant.HTTPMethod_POST, path, nil, req, &resp)
+	return &resp, err
+}