FSK frequency, data rate not configured to basicstation

[ywa037]

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

What happened?

{"msgtype":"router_config","NetID":null,"JoinEui":null,"region":"AS923","hwspec":"sx1301/1","freq_range":[915000000,928000000],"DRs":[[12,125,0],[11,125,0],[10,125,0],[9,125,0],[8,125,0],[7,125,0],[7,250,0],[0,0,0],[-1,0,0],[-1,0,0],[-1,0,0],[-1,0,0],[-1,0,0],[-1,0,0],[-1,0,0],[-1,0,0]],"sx1301_conf":[{"radio_0":{"enable":true,"freq":917700000},"radio_1":{"enable":true,"freq":918700000},"chan_FSK":{"enable":true},"chan_Lora_std":{"enable":true,"radio":1,"if":-100000,"bandwidth":250000,"spread_factor":7},"chan_multiSF_0":{"enable":true,"radio":0,"if":-400000},"chan_multiSF_1":{"enable":true,"radio":0,"if":-200000},"chan_multiSF_2":{"enable":true,"radio":0,"if":0},"chan_multiSF_3":{"enable":true,"radio":0,"if":200000},"chan_multiSF_4":{"enable":true,"radio":0,"if":400000},"chan_multiSF_5":{"enable":true,"radio":1,"if":-400000},"chan_multiSF_6":{"enable":true,"radio":1,"if":-200000},"chan_multiSF_7":{"enable":true,"radio":1,"if":0}}],"MuxTime":1730103464.535724}"

What did you expect?

FSK frequency, data rate not configured to basicstation

Steps to reproduce this issue

Steps:

Modify chipstack gateway-bridge.toml and add FSK configuration，as:
[backend.basic_station.concentrators.fsk]
frequency=919000000
2.
3.
4.

Could you share your log output?

Your Environment

Component	Version
Application Server	v?.?.?
Network Server
Gateway Bridge
Chirpstack API
Geolocation
Concentratord

[ywa037]

chirpstack-gateway-bridge version 4.0.10

[sp193]

The logic for setting the centre frequency and bitrate is missing for FSK mode: https://github.com/chirpstack/chirpstack-gateway-bridge/blob/master/internal/backend/basicstation/structs/router_config.go#L244

				c.SX1301Conf[concentratorNum].ChanFSK = SX1301ConfChanFSK{
					Enable: true,
				}

The FSK configuration structure itself is not complete.

// SX1301ConfChanFSK implements the FSK channel configuration.
type SX1301ConfChanFSK struct {
	Enable bool `json:"enable"`
}

When compared to the BasicStation's definition:

  "chan_FSK": {
    "enable": BOOL,
    "radio": 0|1,
    "if": INT
  },