Add igiRadio iOS/iPadOS app for DigiRadio control.

Introduces a new SwiftUI app with HTTP REST device control, mock mode for UI development, BLE-based discovery, and documented architecture aligned with the firmware API.

Co-authored-by: Cursor <cursoragent@cursor.com>

Software/APP/igiRadio/Documentation/APP_ARCHITECTURE.md

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+# APP_ARCHITECTURE — igiRadio
+
+## Stack
+
+```
+SwiftUI Views
+    ↓ @Observable ViewModels
+DigiRadioService (protocol)
+    ↓
+RealDigiRadioService ──→ HTTPDigiRadioClient (URLSession)
+MockDigiRadioService   ──→ dati in-memory
+
+BLEProvisioningService (solo setup Wi‑Fi)
+    ↓ CoreBluetooth + protocomm (ESP Security1)
+```
+
+## Principi
+
+1. Le View **non** chiamano URLSession o CoreBluetooth direttamente.
+2. Un solo `DigiRadioState` osservabile aggiornato dal service.
+3. Errori tipizzati (`DigiRadioError`).
+4. Dependency injection via `AppEnvironment` in `igiRadioApp`.
+
+## Connessione
+
+| Fase | Meccanismo |
+|------|------------|
+| Prima configurazione | BLE provisioning **oppure** join SoftAP + POST /api/wifi |
+| Uso normale | mDNS `digiradio-xxxxxx.local` o IP manuale |
+| Base URL | `http://{host}/api/...` |
+
+## Polling vs push
+
+- Nessuna notifica BLE documentata per stato tuner.
+- `TunerViewModel` può pollare `GET /api/tuner/status` a intervallo configurabile quando la schermata radio è attiva.