feat(ios): implement SwiftUI companion with isolated WKWebView sessions

Add HTTPS onboarding, origin policy, native recovery/settings, isolated web sign-in and file export. Portable production URL policy tests pass on Linux; all Swift sources parse. Xcode build and simulator validation remain required on macOS.

ios/Package.swift

@@ -0,0 +1,15 @@
+// swift-tools-version: 6.0
+import PackageDescription
+
+// Portable tests for the exact production URL policy. This is not an iOS build.
+let package = Package(
+    name: "YuvomiPolicy",
+    products: [.library(name: "Yuvomi", targets: ["Yuvomi"])],
+    targets: [
+        .target(name: "Yuvomi", path: "Sources", exclude: [
+            "AuthenticationView.swift", "BrowserModel.swift", "ContentView.swift",
+            "ServerProbe.swift", "YuvomiApp.swift", "PrivacyInfo.xcprivacy"
+        ], sources: ["ServerAddress.swift"]),
+        .testTarget(name: "YuvomiPolicyTests", dependencies: ["Yuvomi"], path: "Tests")
+    ]
+)