Bump go-cart-actor: scheduling cluster service + booking-hold cart/checkout seam

Deploys cmd/scheduling as a 3-replica actor cluster (shared RWX commerce-data
event logs, gRPC mesh via POD_IP + actor-pool label, edge /api/scheduling
pass-through, fail-closed mcpauth on admin/MCP). cart/checkout get
SCHEDULING_SERVICE_URL so line removal releases holds; backoffice gets
SCHEDULING_URL for the admin proxy. Platform seam: order.Line.Properties
carries booking_* fields through order.created; scheduling.booking_confirmed/
cancelled event types. Compose + prep-dev-data wire the schedules dir.

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Co-Authored-By: Codebuff <noreply@codebuff.com>

order/order.go

@@ -28,6 +28,12 @@ type Line struct {
 	// DropShip marks items fulfilled directly by the supplier. The inventory
 	// reactor must skip the stock decrement for these lines.
 	DropShip bool `json:"drop_ship,omitempty"`
+	// Properties carries per-line domain attributes a reactor needs that don't
+	// fit the fixed fields — e.g. booking_hold_id / booking_start / booking_end
+	// for the scheduling service's order.created commit reactor (wire-safe
+	// addition, same precedent as Created.CheckoutID). Optional; reactors must
+	// tolerate absent properties on every line.
+	Properties map[string]string `json:"properties,omitempty"`
 }
 
 // Created is the payload of an event.OrderCreated envelope.
@@ -40,15 +46,15 @@ type Created struct {
 	OrderReference string `json:"order_reference,omitempty"`
 	CartID         string `json:"cart_id,omitempty"`
 	// CheckoutID links the originating checkout grain (wire-safe addition).
-	CheckoutID     string `json:"checkout_id,omitempty"`
-	Country        string `json:"country"`
-	Currency       string `json:"currency,omitempty"`
-	CustomerEmail  string `json:"customer_email,omitempty"`
+	CheckoutID    string `json:"checkout_id,omitempty"`
+	Country       string `json:"country"`
+	Currency      string `json:"currency,omitempty"`
+	CustomerEmail string `json:"customer_email,omitempty"`
 	// CustomerID is the customer profile ID for identity linking (B0.4). Reactors
 	// (e.g. profile service) use this to link the order to the customer profile.
-	CustomerID  string `json:"customer_id,omitempty"`
-	Lines       []Line `json:"lines"`
-	PlacedAtMs  int64  `json:"placed_at_ms,omitempty"`
+	CustomerID string `json:"customer_id,omitempty"`
+	Lines      []Line `json:"lines"`
+	PlacedAtMs int64  `json:"placed_at_ms,omitempty"`
 }
 
 // Encode serialises the payload for event.Event.Payload.
@@ -122,8 +128,8 @@ func DecodeInvoicePaid(raw []byte) (InvoicePaid, error) {
 // (1510 C / 304x D / 261x D per rate), idempotent per credit number.
 type InvoiceCredited struct {
 	OrderID       string      `json:"order_id"`
-	InvoiceNumber string      `json:"invoice_number"`   // the original invoice
-	CreditNumber  string      `json:"credit_number"`    // from the same gap-free series
+	InvoiceNumber string      `json:"invoice_number"` // the original invoice
+	CreditNumber  string      `json:"credit_number"`  // from the same gap-free series
 	CompanyID     string      `json:"company_id,omitempty"`
 	OcrReference  string      `json:"ocr_reference,omitempty"`
 	AmountIncVat  int64       `json:"amount_inc_vat"`
@@ -186,4 +192,3 @@ func DecodeRefundIssued(raw []byte) (RefundIssued, error) {
 	err := json.Unmarshal(raw, &r)
 	return r, err
 }
-