added place to telecommunication, added contract documents, added invoice to other contracts

backend/prisma/schema.prisma

@@ -656,11 +656,29 @@ model Contract {
   tasks                   ContractTask[]
   assignedEmails          CachedEmail[]   // Zugeordnete E-Mails aus dem E-Mail-Client
   historyEntries          ContractHistoryEntry[]
+  documents               ContractDocument[]
+  invoices                Invoice[]
 
   createdAt               DateTime        @default(now())
   updatedAt               DateTime        @updatedAt
 }
 
+// ==================== CONTRACT DOCUMENTS ====================
+
+model ContractDocument {
+  id            Int       @id @default(autoincrement())
+  contractId    Int
+  contract      Contract  @relation(fields: [contractId], references: [id], onDelete: Cascade)
+  documentType  String                    // Auftragsformular, Lieferbestätigung, etc.
+  documentPath  String                    // Dateipfad
+  originalName  String                    // Originaler Dateiname
+  notes         String?   @db.Text
+  uploadedBy    String?                   // Wer hat hochgeladen
+  createdAt     DateTime  @default(now())
+
+  @@index([contractId])
+}
+
 // ==================== CONTRACT HISTORY ====================
 
 model ContractHistoryEntry {
@@ -753,8 +771,10 @@ model ContractMeter {
 
 model Invoice {
   id                      Int                   @id @default(autoincrement())
-  energyContractDetailsId Int
-  energyContractDetails   EnergyContractDetails @relation(fields: [energyContractDetailsId], references: [id], onDelete: Cascade)
+  energyContractDetailsId Int?
+  energyContractDetails   EnergyContractDetails? @relation(fields: [energyContractDetailsId], references: [id], onDelete: Cascade)
+  contractId              Int?
+  contract                Contract?             @relation(fields: [contractId], references: [id], onDelete: Cascade)
   invoiceDate             DateTime
   invoiceType             InvoiceType
   documentPath            String?               // Pflicht, außer bei NOT_AVAILABLE
@@ -763,6 +783,7 @@ model Invoice {
   updatedAt               DateTime              @updatedAt
 
   @@index([energyContractDetailsId])
+  @@index([contractId])
 }
 
 // ==================== INTERNET CONTRACT DETAILS ====================
@@ -779,6 +800,10 @@ model InternetContractDetails {
   // Internet-Zugangsdaten
   internetUsername          String?
   internetPasswordEncrypted String?       // Verschlüsselt gespeichert
+  // Objekt & Lage
+  propertyType              String?       // Objekttyp (Mehrparteienhaus, Freistehendes Haus, etc.)
+  propertyLocation          String?       // Lage (Erdgeschoss, OG1, etc.)
+  connectionLocation        String?       // Lage des Anschlusses (Flur, HWR, etc.)
   // Glasfaser-spezifisch
   homeId                    String?
   // Vodafone DSL/Kabel spezifisch