fix(storefront): fill the delivery quote and checkout query params

[roncodes]

Both requests shipped every query parameter empty, so each failed on its own validation and the published reference showed no values for endpoints that cannot work without them — the same gap as the empty request bodies in #29.

Retrieve a Delivery Service Quote — "The origin field is required."

origin and destination accept five forms, all handled by getPlaceFromId(): a place id, a store_location id, a vehicle id, a food_truck id, or a "lat,lng" pair.

Coordinates are used because that is what a storefront client usually has — the store's position and the customer's address — and because it needs no fixture. The comment documents the other four forms.

It now also captures {{service_quote_id}}, which Checkout/Before addresses and nothing set.

Before — "The gateway field is required."

gateway is the gateway code, not an id: CheckoutController reads $request->input('gateway') and resolves it with Storefront::findGateway(). "stripe" matches the code on the gateway the contract run seeds. The remaining params reuse variables the run already has.

It now captures {{checkout_token}}, which Capture checkout as order and Get Checkout Status both address and nothing set.

Chain

These two are the head of the checkout chain — Capture checkout as order and Get Checkout Status currently fail behind them on the unset token, and Update Stripe Payment Intent on the unset service_quote.

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