fix(jpush): correct SendNo field type from int64 to string in PushResponse

The JPush API returns sendno as a string value in the JSON response, but the
struct field was incorrectly typed as int64. This fix updates both the struct
field type and the corresponding zap logger call to use string type, ensuring
proper JSON parsing and logging.

internal/pkg/jpush/client.go

@@ -86,7 +86,7 @@ type PushOptions struct {
 
 type PushResponse struct {
 	MsgID  string `json:"msg_id"`
-	SendNo int64  `json:"sendno"`
+	SendNo string `json:"sendno"`
 }
 
 type RateLimitInfo struct {
@@ -208,7 +208,7 @@ func (c *Client) Push(payload map[string]any) (*PushResponse, *RateLimitInfo, er
 	} else {
 		c.logger.Debug("jpush push response",
 			zap.String("msg_id", result.MsgID),
-			zap.Int64("send_no", result.SendNo),
+			zap.String("send_no", result.SendNo),
 		)
 	}
 	return result, rateLimit, parseErr