feat(01-04): wire JVM + Wasm main + Swift iOSApp to bootstrap Koin + Kermit

- Desktop main() calls configureLogging() → initKoin() before application { Window { App() } }
- Wasm main() calls configureLogging() → initKoin() before ComposeViewport { App() } (PITFALL #8 future-proof)
- iOSApp.swift imports ComposeApp and calls KoinIosKt.doInitKoin() in init() — single iOS call site (PITFALL #4)
- MainViewController.kt and App.kt unmodified (anti-pattern guards)

iosApp/iosApp/iOSApp.swift

@@ -1,7 +1,12 @@
 import SwiftUI
+import ComposeApp
 
 @main
 struct iOSApp: App {
+    init() {
+        KoinIosKt.doInitKoin()
+    }
+
     var body: some Scene {
         WindowGroup {
             ContentView()