feat: Begins breaking database out into it's own module, using dependencies

Sources/SharedModels/PurchaseOrder.swift

@@ -0,0 +1,40 @@
+import Dependencies
+import Foundation
+
+public struct PurchaseOrder: Codable, Equatable, Identifiable, Sendable {
+
+  public let id: Int
+  public var workOrder: Int?
+  public var materials: String
+  public var customer: String
+  public var truckStock: Bool
+  public var createdBy: User
+  public var createdFor: Employee
+  public var vendorBranch: VendorBranch
+  public var createdAt: Date?
+  public var updatedAt: Date?
+
+  public init(
+    id: Int,
+    workOrder: Int? = nil,
+    materials: String,
+    customer: String,
+    truckStock: Bool,
+    createdBy: User,
+    createdFor: Employee,
+    vendorBranch: VendorBranch,
+    createdAt: Date?,
+    updatedAt: Date?
+  ) {
+    self.id = id
+    self.workOrder = workOrder
+    self.materials = materials
+    self.customer = customer
+    self.truckStock = truckStock
+    self.createdBy = createdBy
+    self.createdFor = createdFor
+    self.vendorBranch = vendorBranch
+    self.createdAt = createdAt
+    self.updatedAt = updatedAt
+  }
+}