L2 Aufträge & Backoffice: Service-Schicht Aufträge + Tests

Statusmaschine (transitionWorkOrder inkl. eventData), Zuweisung, Completion-Guards,
Materialvorgabe, Checklisten/Pflichtfotos, Liste/Dashboard-Presets, Suche,
Sync-Konflikte, Einstellungen (Auftragsarten, Vorlagen, Nummernkreise).
Tests: Übergangsmatrix je Rolle, Kernlogik, Scope/Mandantentrennung, Nummernkreis-Parallelität.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/server/services/work-orders/release-billing.ts

@@ -0,0 +1,34 @@
+import type { ServiceCtx } from "@/server/services/context";
+import { transitionWorkOrder, type TransitionResult } from "@/server/services/work-orders/transition";
+
+/**
+ * Billing workflow (US-009). All paths go through transitionWorkOrder, which enforces
+ * `work_order:release_billing` and — for the release — an approved completion report.
+ * The event `work_order.released_for_billing` is emitted by the transition.
+ */
+export async function releaseForBilling(
+  ctx: ServiceCtx,
+  input: { workOrderId: string; baseVersion?: number },
+): Promise<TransitionResult> {
+  return transitionWorkOrder(ctx, { workOrderId: input.workOrderId, to: "released_for_billing", baseVersion: input.baseVersion });
+}
+
+/** Reject: back to the team for correction (in_review → in_progress), reason mandatory. */
+export async function rejectForCorrection(
+  ctx: ServiceCtx,
+  input: { workOrderId: string; reason: string; baseVersion?: number },
+): Promise<TransitionResult> {
+  return transitionWorkOrder(ctx, { workOrderId: input.workOrderId, to: "in_progress", reason: input.reason, baseVersion: input.baseVersion });
+}
+
+/** Revoke a billing release (released_for_billing → in_review), reason mandatory. */
+export async function revokeBillingRelease(
+  ctx: ServiceCtx,
+  input: { workOrderId: string; reason: string; baseVersion?: number },
+): Promise<TransitionResult> {
+  return transitionWorkOrder(ctx, { workOrderId: input.workOrderId, to: "in_review", reason: input.reason, baseVersion: input.baseVersion });
+}
+
+export async function markBilled(ctx: ServiceCtx, input: { workOrderId: string; baseVersion?: number }): Promise<TransitionResult> {
+  return transitionWorkOrder(ctx, { workOrderId: input.workOrderId, to: "billed", baseVersion: input.baseVersion });
+}