feat: add EAS build configuration for local APK builds

- Add eas.json with development, preview, and production profiles
- Configure preview profile for APK builds (arm64-v8a only)
- Add build:apk npm script for local builds
- Update app.json with app name and Android package
- Add expo-build-properties dependency
- Update CLAUDE.md with build documentation

apps/client/eas.json

@@ -0,0 +1,28 @@
+{
+  "cli": {
+    "version": ">= 16.28.0",
+    "appVersionSource": "remote"
+  },
+  "build": {
+    "development": {
+      "developmentClient": true,
+      "distribution": "internal"
+    },
+    "preview": {
+      "distribution": "internal",
+      "android": {
+        "buildType": "apk",
+        "withoutCredentials": true
+      },
+      "env": {
+        "ORG_GRADLE_PROJECT_reactNativeArchitectures": "arm64-v8a"
+      }
+    },
+    "production": {
+      "autoIncrement": true
+    }
+  },
+  "submit": {
+    "production": {}
+  }
+}