Merge lane/abrechnung in feature/craftvia-mvp

Konflikte gelöst (additiv): Benachrichtigungstexte (Planung + Meilensteine), Event-Typen,
Navigation, Job-Queues/Prozessoren (geocode-site, planning-watch, billing-pdf), OpenAPI-Tags,
Smoke-Prüfungen (zweiter Mandant: Planung + Abrechnung).

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

src/app/(app)/work-orders/[id]/page.tsx

@@ -18,6 +18,7 @@ import {
   ReportsTab,
   TimesTab,
 } from "@/components/work-orders/detail-tabs";
+import { WorkOrderBillingTab } from "@/components/billing/work-order-billing-tab";
 import { pageContext } from "@/components/work-orders/page-context";
 import { Field, inputCls, LinkTabs, StatusBadge } from "@/components/work-orders/ui";
 import { WorkOrderFields } from "@/components/work-orders/work-order-fields";
@@ -30,7 +31,7 @@ import { customerDisplayName, customerOption, teamOptions, userOptions } from "@
 import { listOrderTypes } from "@/server/services/work-orders/settings";
 import { reasonRequired } from "@/server/services/work-orders/transition";
 
-const TABS = ["overview", "checklist", "material", "times", "photos", "notes", "reports", "documents", "history"] as const;
+const TABS = ["overview", "checklist", "material", "times", "photos", "notes", "reports", "billing", "documents", "history"] as const; // L14: billing
 type Tab = (typeof TABS)[number];
 type SP = Record<string, string | string[] | undefined>;
 const one = (v: string | string[] | undefined) => (Array.isArray(v) ? v[0] : v);
@@ -202,6 +203,7 @@ export default async function WorkOrderDetailPage({ params, searchParams }: { pa
             }
           />
         )}
+        {tab === "billing" && <WorkOrderBillingTab ctx={ctx} wo={wo} locale={locale} tz={tz} />}
         {tab === "documents" && <DocumentsTab {...tabProps} uploadError={one(sp.uploadError)} uploaded={one(sp.uploaded) === "1"} />}
         {tab === "history" && <HistoryTab {...tabProps} />}
       </div>