WIP quickjs: use commands.CallURL

[mgood]

RunURL doesn't seem to work anymore, params are dropped from the request.
This is still not fully working, but I think part of the necessary change.

With this change, I tried testing transcription, but am getting a new error listed below.

$ go url: "/quickjs"

. eval source: `reflector.run(
  "http://substrate:8080/substrate/v1/msgindex",
  "faster-whisper/transcribe-url",
  {
    task: "transcribe",
    audio_url: "http://substrate:8080/not-needed-here",
    audio_metadata: {mime_type: "audio/wav"}
  }
);
`

2025/04/29 22:12:28 INFO command run() done command=eval parameters="map[arguments:[map[cfg:map[command:faster-whisper/transcribe-url command_url:http://substrate:8080/substrate/v1/msgindex dest_path:/foobar/transcription/segmented stream_url_prefix:https://substrate:8080/webrtc-stream;event_prefix=foobar;sessions=sp-01JRXDBH70GP1DD6SFK7YV2VKH/audio/wav/] events:[map[at:01JSQGNP0NTBGFC3V3ZHV5RQ6M fields:map[end:9.37193292e+08 path:/foobar/tracks/01JSQGNDDM2ZVV7D6VAX62NHAV/activity start:9.37149132e+08] fields_sha256:f4fd9850861eeb1aaa65f361298679dd2167a038c42875c1468315d508b79ef4 fields_size:95 id:01JSQGNP0NTBGFC3V3ZHV5RQ6M since:01JSQGNND0B9X29Q1F66D67ZPH]]]]
source:\n                function x({ events, cfg: {command_url, command, stream_url_prefix, dest_path} }) {...]" returns=map[]
err="Error: error applying capability! reflectedmsg: error applying capability! seq: no value for []string{\"cap\"} in commands.Fields{\"data\":map[string]interface {}{\"parameters\":map[string]interface {}{\"audio_metadata\":map[string]interface {}{\"mime_type\":\"audio/wav\"}, \"audio_url\":\"https://substrate:8080/webrtc-stream;event_prefix=foobar;sessions=sp-01JRXDBH70GP1DD6SFK7YV2VKH/audio/wav/undefined?%7B%22segments%22%3A%5B%7B%22start%22%3A937149132%2C%22end%22%3A937193292%7D%5D%7D\", \"task\":\"transcribe\"}}}”

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