feat: add iOS support and harden receipt scanning

app/ios/ScanReceipts/Models/Project.swift

@@ -0,0 +1,26 @@
+import Foundation
+
+/// Mirrors the objects returned by `GET /api/projects` (src/app/api/projects/route.ts).
+/// Projects are Pro-only "folders" receipts can be filed under.
+struct Project: Codable, Identifiable, Equatable {
+    let id: String
+    var name: String
+    var color: String?
+    var receiptCount: Int
+    let createdAt: String
+    let updatedAt: String
+
+    /// Fixed palette the web app offers when creating/editing a project —
+    /// keep in sync with `PROJECT_COLORS` in src/app/api/projects/route.ts.
+    static let colorPalette = ["slate", "blue", "emerald", "amber", "rose", "violet"]
+}
+
+struct ProjectListResponse: Decodable {
+    let success: Bool
+    let projects: [Project]
+}
+
+struct CreateProjectRequest: Encodable {
+    let name: String
+    let color: String?
+}