Buy on StoreKit and Play Billing, then confirm with the backend (#78).

Native purchases replace RevenueCat. The app sends the signed transaction or Play token to /monetization/store/confirm/ so access is granted only after the store check.

llm-fe/plugins/native-store-billing/package.json

@@ -0,0 +1,26 @@
+{
+  "name": "native-store-billing",
+  "version": "0.1.0",
+  "private": true,
+  "description": "StoreKit and Play Billing purchases for the Hesychia Capacitor shell.",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "capacitor": {
+    "ios": {
+      "src": "ios"
+    },
+    "android": {
+      "src": "android"
+    }
+  },
+  "files": [
+    "android/src/main/",
+    "android/build.gradle",
+    "ios/Sources",
+    "NativeStoreBilling.podspec",
+    "dist/"
+  ],
+  "peerDependencies": {
+    "@capacitor/core": ">=7.0.0"
+  }
+}