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>

messages/en/workOrders.json

@@ -156,7 +156,8 @@
       "notes": "Notes",
       "reports": "Reports",
       "documents": "Documents",
-      "history": "History"
+      "history": "History",
+      "billing": "Milestones & billing"
     }
   },
   "overview": {