feat: Umstellung auf Anthropic Claude SDK, Rechnungsgenerator-Systemtemplate und Task-Status-Sync

- LLM-Integration von LM Studio (Spring AI OpenAI) auf Anthropic Java SDK umgestellt
- Rechnungsgenerator: System-Template für Rechnungen an Nutzer, Canvas leeren, PDF-Vorschau
- Job manuell beenden sendet job_deleted an verbundene App-Clients
- MessageController: nur offene Jobs ausliefern, station_completed per jobId auflösen
- App: Task-Erledigungsstatus aus Server-Tasks auf Stations-Snapshots übernehmen, lokale Task-Status bei Offline-Pufferung erhalten
- Adressbuch-Wording in allen Sprachdateien, Version 0.9.18

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

backend/src/main/resources/messages_tr.properties

@@ -240,7 +240,7 @@ page.title.dashboard=VotianLT - Kontrol Paneli
 page.title.appuser.create=Yeni Uygulama Kullan\u0131c\u0131s\u0131 Olu\u015ftur
 page.title.messages=Mesajlar
 page.title.register=VotianLT'ye Kay\u0131t Ol
-page.title.customers=M\u00fc\u015fteriler
+page.title.customers=Adres defteri
 page.title.customer.edit=M\u00fc\u015fteriyi D\u00fczenle
 page.title.verwaltung=Y\u00f6netim
 page.title.company.create=Yeni \u015eirket Olu\u015ftur
@@ -248,7 +248,7 @@ page.title.imprint=K\u00fcnye
 page.title.profile.edit=Profili D\u00fczenle
 page.title.admin.dashboard=Y\u00f6netici Kontrol Paneli
 page.title.invoice.create=Fatura Olu\u015ftur
-page.title.customer.create=Yeni M\u00fc\u015fteri Olu\u015ftur
+page.title.customer.create=Yeni Adres Olu\u015ftur
 page.title.login=VotianLT'ye Giri\u015f Yap
 page.title.jobs=\u0130\u015fler
 page.title.appuser.edit=Uygulama Kullan\u0131c\u0131s\u0131n\u0131 D\u00fczenle
@@ -327,9 +327,9 @@ editappuser.dialog.delete.text=Bu uygulama kullan\u0131c\u0131s\u0131n\u0131 sil
 editappuser.dialog.delete.confirm=Sil
 
 # Customers
-customers.title=M\u00fc\u015fteriler
-customers.button.add=Yeni M\u00fc\u015fteri Ekle
-customers.hint.click=Ayr\u0131nt\u0131lar\u0131 g\u00f6rmek i\u00e7in bir m\u00fc\u015fteriye t\u0131klay\u0131n
+customers.title=Adres defteri
+customers.button.add=Yeni Adres Ekle
+customers.hint.click=Ayr\u0131nt\u0131lar\u0131 g\u00f6rmek i\u00e7in bir adres giri\u015fine t\u0131klay\u0131n
 customers.column.company=\u015eirket
 customers.column.name=Ad
 customers.column.email=E-Posta
@@ -348,8 +348,8 @@ editcustomer.dialog.delete.text=Bu m\u00fc\u015fteriyi silmek istedi\u011finizde
 editcustomer.dialog.delete.confirm=Sil
 
 # Add Customer
-addcustomer.title=Yeni M\u00fc\u015fteri Olu\u015ftur
-addcustomer.button.submit=M\u00fc\u015fteri Olu\u015ftur
+addcustomer.title=Yeni Adres Olu\u015ftur
+addcustomer.button.submit=Adres Olu\u015ftur
 addcustomer.notification.validation=L\u00fctfen t\u00fcm zorunlu alanlar\u0131 doldurun
 addcustomer.notification.success=M\u00fc\u015fteri ba\u015far\u0131yla olu\u015fturuldu
 addcustomer.notification.check=L\u00fctfen giri\u015flerinizi kontrol edin
@@ -987,3 +987,24 @@ adminpricetable.field.revenue=Gelir Pay\u0131
 adminpricetable.notification.saved=Fiyat tablosu kaydedildi
 adminpricetable.notification.save.error=Kaydetme hatas\u0131: {0}
 adminpricetable.notification.load.error=Y\u00fckleme hatas\u0131: {0}
+
+# Fatura oluşturucu - sistem şablonu (kullanıcılara faturalar)
+invoicegenerator.issuer.header=Fatura düzenleyen
+invoicegenerator.issuer.website=Web sitesi
+invoicegenerator.issuer.senderline=Gönderen satırı
+invoicegenerator.issuer.paymentterms=Ödeme koşulları
+invoicegenerator.issuer.footer=Alt bilgi
+invoicegenerator.issuer.invoicedate=Fatura tarihi
+invoicegenerator.recipient.header=Alıcı (kullanıcı)
+invoicegenerator.recipient.company=Kullanıcı firması
+invoicegenerator.recipient.name=Kullanıcı adı
+invoicegenerator.recipient.street=Kullanıcı sokağı
+invoicegenerator.recipient.city=Kullanıcı şehri
+invoicegenerator.recipient.email=Kullanıcı e-postası
+invoicegenerator.template.saved=Şablon kaydedildi
+invoicegenerator.template.save.error=Şablon kaydedilirken hata: {0}
+invoicegenerator.button.clear=Temizle
+invoicegenerator.notification.cleared=Tuval temizlendi
+invoicegenerator.notification.canvas.error=Tuval verileri okunamadı
+invoicegenerator.notification.preview.error=Önizleme hatası: {0}
+invoicegenerator.pdf.preview.title=PDF önizleme