scrypted: make undici dispatcher optional, fall back to per-POST sockets

Scrypted's plugin sandbox doesn't always expose 'undici' as a
require()-able module — it's bundled into the runtime but only
reachable through globalThis.fetch internals, not as a CommonJS
module. require('undici') threw and broke registerViewport entirely.

Wrap the require in try/catch and cache the result. When undici is
available we still get keep-alive + 2 socket pool for pipelining;
when it isn't, dispatcherFor returns undefined and we fall back to
plain fetch with a fresh socket per POST. The X-Frame-Seq
deduplication on the firmware side still works regardless — even
without socket pooling, two fetch() calls can be in flight on two
separate ephemeral sockets concurrently.

0 files changed, 0 insertions, 0 deletions