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/lib/nav.ts

@@ -18,6 +18,7 @@ import {
   CalendarRange,
   LayoutGrid,
   MapPinned,
+  Receipt,
   type LucideIcon,
 } from "lucide-react";
 import type { ModuleKey } from "@/lib/modules";
@@ -62,6 +63,7 @@ export const NAV_ITEMS: readonly NavItem[] = [
     section: "main",
   },
   { href: "/work-orders/time-approvals", label: "timeApprovals", icon: Timer, module: "work_orders", permissions: ["time:approve"], section: "main" },
+  { href: "/billing", label: "billing", icon: Receipt, module: "billing", permissions: ["billing:read"], section: "main" }, // L14
   { href: "/work-orders/emergency-review", label: "emergencyReview", icon: Siren, module: "emergency", permissions: ["emergency:review"], section: "main" },
   { href: "/imports", label: "imports", icon: FileInput, module: "imports", permissions: ["import:write"], section: "main" },
   { href: "/customers", label: "customers", icon: Users, module: "customers", permissions: ["customer:read"], section: "main" },