Added the catalogue models and seed to support phase 5 of the POC prototype in the Persistence package.

Packages/Persistence/Sources/Public/Models/ShopDraft.swift

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+/// What an account fills in to open a shop.
+public struct ShopDraft: Sendable, Equatable {
+
+    // MARK: Properties
+
+    /// The shop's name.
+    public var name: String
+    /// The shop's handle: its URL slug.
+    public var handle: String
+    /// The city the shop ships from.
+    public var city: String
+    /// The ISO 3166-1 alpha-2 code of the country the shop ships from.
+    public var country: String
+    /// The shop's description of itself.
+    public var about: String
+    /// Whether the seller sells as a private collector or as a business.
+    public var kind: Shop.Kind
+    /// The business's KvK number.
+    public var kvkNumber: String?
+    /// The business's VAT identifier.
+    public var vatID: String?
+    /// The business's registered name.
+    public var legalName: String?
+    /// The shop's returns policy, in a few words.
+    public var returnsNote: String
+    /// The shop's handling time, in business days.
+    public var handlingDays: Int
+
+    // MARK: Initializers
+
+    public init(
+        name: String,
+        handle: String,
+        city: String,
+        country: String,
+        about: String,
+        kind: Shop.Kind,
+        kvkNumber: String?,
+        vatID: String?,
+        legalName: String?,
+        returnsNote: String,
+        handlingDays: Int
+    ) {
+        self.name = name
+        self.handle = handle
+        self.city = city
+        self.country = country
+        self.about = about
+        self.kind = kind
+        self.kvkNumber = kvkNumber
+        self.vatID = vatID
+        self.legalName = legalName
+        self.returnsNote = returnsNote
+        self.handlingDays = handlingDays
+    }
+
+}