feat: Kundenauswahl vereinheitlicht und Job manuell beenden mit Leistungs-/Routenerfassung

- Kunden-Repository liefert auch Legacy-Dokumente ohne internal-Flag ($ne: true)
- Auftraggeber- und Abholadress-Labels über neuen CustomerAddressLabelHelper, zeigen nur Firmenname bzw. Vor-/Nachname ohne Adresszusatz
- Pickup-Dialog: E-Mail ist kein Pflichtfeld mehr
- JobManualCompleteView erhält Route-/Leistungen-/Zusammenfassung-/Bemerkung-Block mit Vorbelegung aus dem Auftrag; bei fehlenden Routendaten manuelle Eingabe von Entfernung und Dauer, die in die Preisermittlung einfliessen

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/src/main/resources/messages_en.properties

@@ -429,9 +429,9 @@ messages.sender.unknown=Unknown Sender
 
 # Add Job
 addjob.title=Create New Job
-addjob.customer.label=Customer
-addjob.customer.placeholder=Select Customer
-addjob.customer.unnamed=Unnamed Customer
+addjob.customer.label=Principal
+addjob.customer.placeholder=Select principal
+addjob.customer.unnamed=Unnamed principal
 addjob.button.clearfields=Clear Fields
 addjob.button.submit=Create Job
 addjob.address.salutation=Salutation
@@ -440,6 +440,10 @@ addjob.salutation.mr=Mr
 addjob.salutation.ms=Ms
 addjob.salutation.other=Other
 addjob.address.company.placeholder=Enter company
+addjob.address.pickup.label=Pickup address
+addjob.address.pickup.placeholder=Select or enter pickup address
+addjob.address.delivery.label=Delivery address
+addjob.address.delivery.placeholder=Select or enter delivery address
 addjob.address.street.placeholder=Enter street
 addjob.address.housenumber=House Number
 addjob.address.addition.placeholder=Address suffix
@@ -460,6 +464,8 @@ addjob.station.max.reached=Maximum number of 25 delivery stations reached
 addjob.station.unused=Not used
 addjob.appointment.delivery.info=Delivery dates are set directly in the delivery stations.
 addjob.tab.addresses=Client & Addresses
+addjob.tab.pickup.address=Principal & Pickup Address
+addjob.tab.delivery.address=Delivery Address
 addjob.tab.appointments=Appointments & Processing
 addjob.tab.cargo=Cargo
 addjob.tab.tasks=Tasks
@@ -621,6 +627,9 @@ jobsummary.dialog.manualcomplete.reason.required=Please enter a reason
 jobsummary.dialog.manualcomplete.cancel=Cancel
 jobsummary.dialog.manualcomplete.confirm=Accept
 jobsummary.history.manualcomplete.reason=Manually completed
+jobmanualcomplete.route.hours=Hours
+jobmanualcomplete.route.minutes=Minutes
+jobmanualcomplete.route.manual.hint=No route data available – please enter distance and duration manually.
 
 # Jobs
 jobs.title=Jobs