fix: PascalCase JSON fields + code:200 success + Unix timestamp ExpDate

internal/provider/rainyun/server.go

@@ -13,9 +13,9 @@ type ServerService struct {
 	client *client
 }
 
-// rainyunServer mirrors the Rainyun RCS API JSON fields.
+// rainyunServer mirrors the Rainyun RCS API JSON fields (PascalCase).
 type rainyunServer struct {
-	ID         int    `json:"id"`
+	ID         int    `json:"ID"`
 	Name       string `json:"name"`
 	Status     string `json:"status"`
 	IP         string `json:"ip"`
@@ -24,7 +24,7 @@ type rainyunServer struct {
 	Disk       int    `json:"disk"`
 	OS         string `json:"os"`
 	Region     string `json:"zone_name"`
-	ExpireDate string `json:"expire_date"`
+	ExpireDate int64  `json:"ExpDate"` // Unix timestamp
 }
 
 func (s *ServerService) List(ctx context.Context) ([]provider.Server, error) {
@@ -87,7 +87,7 @@ func (s *ServerService) Upgrade(ctx context.Context, id, plan string) error {
 
 // toServer maps a rainyunServer to the provider.Server model.
 func toServer(r rainyunServer) provider.Server {
-	expire, _ := time.Parse("2006-01-02", r.ExpireDate)
+	expire := time.Unix(r.ExpireDate, 0)
 	return provider.Server{
 		ID:       fmt.Sprintf("%d", r.ID),
 		Name:     r.Name,