iOS-App angefangen; Import-Modi; MHD-Formatierung; Gebinde in Ablauf-Ansichten

iOS (neu, ios/):
- SwiftUI-App: Login (Server + Keychain-Token), Kamera-Scanner (EAN/UPC/Code128),
  Einlagern mit mehreren Chargen und eigenem MHD, Auslagern mit Chargenauswahl
  oder FEFO, Artikelsuche, Anlegen mit Open-Food-Facts-Vorbefuellung.
- Home-Screen-Shortcuts: Schnellaktionen (langer Druck) und URL-Schema
  projectgood://checkin | ://checkout fuer eigene Symbole via Kurzbefehle.
- project.yml (XcodeGen) + README mit Build-Anleitung. NICHT kompiliert - auf
  diesem Rechner ist kein Xcode vorhanden.

Import-Modi (wie besprochen sinnvoll):
- add (Standard, nichts loeschen), replace_listed (Bestaende der in der Datei
  genannten Produkte ersetzen - fuer Inventur), replace_all (alles ersetzen).
  Geleerte Bestaende werden als Korrektur-Bewegung protokolliert; die Oberflaeche
  fragt bei den zerstoerenden Modi nach.

Anzeige:
- "Bald ablaufend"/"Abgelaufen" zeigen jetzt das Gebinde ("1 Glas") mit der
  Basiseinheit klein darunter (ExpiringItem liefert die Einheiten mit).
- MHD als Zeitspanne mit korrektem Numerus: "in 3 Tagen", "in 1 Woche",
  "vor 2 Wochen", dazu heute/morgen/gestern.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ios/Sources/Models.swift

@@ -0,0 +1,204 @@
+import Foundation
+
+// Entspricht den Schemas des Backends (backend/app/schemas.py).
+
+struct TokenResponse: Codable {
+    let accessToken: String
+    let role: String
+    let username: String
+
+    enum CodingKeys: String, CodingKey {
+        case accessToken = "access_token"
+        case role, username
+    }
+}
+
+struct MeResponse: Codable {
+    let id: Int
+    let username: String
+    let role: String
+
+    var isAdmin: Bool { role == "admin" }
+}
+
+struct Unit: Codable, Identifiable, Hashable {
+    let id: Int
+    let name: String
+    let kind: String
+    let factor: Double
+}
+
+struct BarcodeEntry: Codable, Identifiable, Hashable {
+    let id: Int
+    let code: String
+    let note: String?
+}
+
+struct Product: Codable, Identifiable, Hashable {
+    let id: Int
+    let barcode: String?
+    let name: String
+    let brand: String?
+    let imageUrl: String?
+    let baseUnit: String
+    let packageSize: Double?
+    let packageLabel: String?
+    let groupId: Int?
+    let minStock: Double?
+    let stock: Double
+    let expiredCount: Int
+    let kind: String
+    let unitName: String
+    let unitFactor: Double
+    let barcodes: [BarcodeEntry]
+
+    enum CodingKeys: String, CodingKey {
+        case id, barcode, name, brand, stock, kind, barcodes
+        case imageUrl = "image_url"
+        case baseUnit = "base_unit"
+        case packageSize = "package_size"
+        case packageLabel = "package_label"
+        case groupId = "group_id"
+        case minStock = "min_stock"
+        case expiredCount = "expired_count"
+        case unitName = "unit_name"
+        case unitFactor = "unit_factor"
+    }
+
+    /// Bezeichnung der Artikeleinheit (Gebinde, sonst Produkteinheit).
+    var articleUnitLabel: String {
+        if let size = packageSize, size > 0 { return packageLabel ?? "Packung" }
+        return unitName
+    }
+
+    /// Faktor, um Basiseinheiten in Artikeleinheiten umzurechnen.
+    var articleUnitFactor: Double {
+        if let size = packageSize, size > 0 { return size }
+        return unitFactor == 0 ? 1 : unitFactor
+    }
+
+    var stockInArticleUnits: Double { stock / articleUnitFactor }
+}
+
+struct LookupResult: Codable {
+    let found: Bool
+    let existingProduct: Product?
+    let suggestion: Suggestion?
+    let groupId: Int?
+    let groupName: String?
+
+    enum CodingKeys: String, CodingKey {
+        case found, suggestion
+        case existingProduct = "existing_product"
+        case groupId = "group_id"
+        case groupName = "group_name"
+    }
+
+    struct Suggestion: Codable {
+        let barcode: String?
+        let name: String
+        let brand: String?
+        let imageUrl: String?
+        let baseUnit: String?
+        let packageSize: Double?
+        let quantityText: String?
+
+        enum CodingKeys: String, CodingKey {
+            case barcode, name, brand
+            case imageUrl = "image_url"
+            case baseUnit = "base_unit"
+            case packageSize = "package_size"
+            case quantityText = "quantity_text"
+        }
+    }
+}
+
+struct Lot: Codable, Identifiable, Hashable {
+    let id: Int
+    let productId: Int
+    let quantity: Double
+    let bestBefore: String?
+    let locationId: Int?
+
+    enum CodingKeys: String, CodingKey {
+        case id, quantity
+        case productId = "product_id"
+        case bestBefore = "best_before"
+        case locationId = "location_id"
+    }
+}
+
+struct StorageLocation: Codable, Identifiable, Hashable {
+    let id: Int
+    let name: String
+    let parentId: Int?
+
+    enum CodingKeys: String, CodingKey {
+        case id, name
+        case parentId = "parent_id"
+    }
+}
+
+struct CheckInLine: Codable {
+    let quantity: Double
+    let bestBefore: String?
+    let locationId: Int?
+
+    enum CodingKeys: String, CodingKey {
+        case quantity
+        case bestBefore = "best_before"
+        case locationId = "location_id"
+    }
+}
+
+struct BatchCheckInRequest: Codable {
+    let productId: Int
+    let unit: String
+    let lines: [CheckInLine]
+
+    enum CodingKeys: String, CodingKey {
+        case unit, lines
+        case productId = "product_id"
+    }
+}
+
+struct CheckOutRequest: Codable {
+    let productId: Int
+    let quantity: Double
+    let unit: String
+    let lotId: Int?
+
+    enum CodingKeys: String, CodingKey {
+        case quantity, unit
+        case productId = "product_id"
+        case lotId = "lot_id"
+    }
+}
+
+struct StockResponse: Codable {
+    let productStock: Double
+
+    enum CodingKeys: String, CodingKey {
+        case productStock = "product_stock"
+    }
+}
+
+struct NewProductRequest: Codable {
+    let barcode: String?
+    let name: String
+    let brand: String?
+    let imageUrl: String?
+    let baseUnit: String
+    let packageSize: Double?
+    let packageLabel: String?
+    let groupId: Int?
+
+    enum CodingKeys: String, CodingKey {
+        case barcode, name, brand
+        case imageUrl = "image_url"
+        case baseUnit = "base_unit"
+        case packageSize = "package_size"
+        case packageLabel = "package_label"
+        case groupId = "group_id"
+    }
+}