Adds lib/xray/inbound-form-adapter.ts with rawInboundToFormValues and
formValuesToWirePayload. The pair is the data boundary the upcoming
Pattern A modal will use: it consumes the DB row shape (settings et al.
as string OR object — coerced internally), hands the modal typed
InboundFormValues, and on submit reverses the trip to a wire payload
with the three JSON-stringified slices the Go endpoints expect.
No dependency on the legacy Inbound/DBInbound classes — the coerce step
is inlined so the adapter survives the eventual models/ deletion.
Adds 10 Vitest cases covering string vs object inputs, the optional
streamSettings/nodeId fields, trafficReset coercion, and a raw-to-payload
-to-raw round-trip equality.
