feat: scaffold offline-first mobile app (RN+Expo, expo-sqlite)

Capa API tipada de los 8 endpoints, BD local espejo del bundle + outbox
(operaciones y media) + cursor de sync, motor runSync (PUSH /sync ->
PUSH /media -> PULL bundle?since) con idempotencia por uuid y last-write-wins,
mutaciones de alto nivel (write local + encolar), sesion con token en
SecureStore, conectividad NetInfo y UI minima (Login -> Proyectos -> Detalle).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app.json

@@ -1,7 +1,7 @@
 {
   "expo": {
-    "name": "__avante_init",
-    "slug": "__avante_init",
+    "name": "Avante",
+    "slug": "avante-movil",
     "version": "1.0.0",
     "orientation": "portrait",
     "icon": "./assets/icon.png",
@@ -20,6 +20,10 @@
     },
     "web": {
       "favicon": "./assets/favicon.png"
-    }
+    },
+    "plugins": [
+      "expo-sqlite",
+      "expo-secure-store"
+    ]
   }
 }