bug: `RenameDevice` sends incomplete PUT body, resets device config fields

[gitcoder89431]

Problem

RenameDevice fetches the full device list, finds the right device, but then only sends deviceID and name in the PUT body:

body, _ := json.Marshal(map[string]any{
    "deviceID": d.DeviceID,
    "name":     name,
})
return c.put("/rest/config/devices/"+deviceID, body)

Syncthing's PUT /rest/config/devices/{id} replaces the entire device object. Any fields not included (addresses, compression, introducedBy, paused, etc.) get reset to defaults. This can silently break device configuration.

Fix

Instead of building a sparse map, marshal the full apiDevice struct with the name overridden:

d.Name = name
body, err := json.Marshal(d)
if err != nil {
    return err
}
return c.put("/rest/config/devices/"+deviceID, body)

Note: apiDevice currently only has DeviceID and Name fields. It needs to be extended to capture all fields Syncthing returns so a round-trip PUT preserves them.

[gitcoder89431]

Fixed in f9cf96a