feat(mobile): Add semantic versioning with standard-version

- Add standard-version for automated version bumping
- Create .versionrc with custom configuration for app.json
- Add version-updater.cjs script for Expo version syncing
- Add version bump scripts (release, release:patch, release:minor, release:major)
- Initialize CHANGELOG.md with v1.0.0 release notes
- Add iOS buildNumber and Android versionCode for app store releases
- Update .gitignore to allow CHANGELOG.md

This establishes proper engineering practices for version management.

mobile/package.json

@@ -29,7 +29,12 @@
     "test:watch": "jest --watch",
     "test:coverage": "jest --coverage",
     "lint": "eslint .",
-    "lint:fix": "eslint . --fix"
+    "lint:fix": "eslint . --fix",
+    "release": "standard-version",
+    "release:patch": "standard-version --release-as patch",
+    "release:minor": "standard-version --release-as minor",
+    "release:major": "standard-version --release-as major",
+    "release:dry-run": "standard-version --dry-run"
   },
   "dependencies": {
     "@babel/runtime": "^7.28.4",
@@ -112,6 +117,7 @@
     "jest-expo": "^54.0.16",
     "react-native": "^0.83.1",
     "react-test-renderer": "19.1.0",
+    "standard-version": "^9.5.0",
     "typescript": "~5.9.2",
     "typescript-eslint": "^8.47.0"
   },