Add missing RN CLI deps, exclude mobile from AWS deploy

react-native 0.79 requires @react-native-community/cli as an
explicit dev dependency for CocoaPods autolinking. Also adds
paths-ignore for mobile/ on the AWS deploy workflow so mobile-only
changes don't trigger unnecessary infrastructure deploys.

.github/workflows/deploy.yaml

@@ -3,6 +3,8 @@ name: Deploy
 on:
   push:
     branches: [main]
+    paths-ignore:
+      - "mobile/**"
 
 concurrency:
   group: deploy-backend

mobile/package.json

@@ -33,6 +33,8 @@
     "react-redux": "^9.2.0"
   },
   "devDependencies": {
+    "@react-native-community/cli": "^20.1.3",
+    "@react-native-community/cli-platform-ios": "^20.1.3",
     "@react-native/babel-preset": "^0.79.0",
     "@react-native/metro-config": "^0.79.0",
     "@types/react": "^19.0.0",