feat:Android notification

apps/frontend/android/app/build.gradle

@@ -1,5 +1,10 @@
+import groovy.json.JsonOutput
+
 apply plugin: 'com.android.application'
 
+def apiBaseUrl = project.hasProperty("API_BASE_URL") ? project.property("API_BASE_URL") : "http://10.0.2.2:4000/api"
+def notificationSecret = project.hasProperty("NOTIFICATION_WEBHOOK_SECRET") ? project.property("NOTIFICATION_WEBHOOK_SECRET") : "CHANGE_ME"
+
 android {
     namespace "com.bill.ai"
     compileSdk rootProject.ext.compileSdkVersion
@@ -15,6 +20,11 @@ android {
              // Default: https://android.googlesource.com/platform/frameworks/base/+/282e181b58cf72b6ca770dc7ca5f91f135444502/tools/aapt/AaptAssets.cpp#61
             ignoreAssetsPattern '!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~'
         }
+        buildConfigField "String", "API_BASE_URL", JsonOutput.toJson(apiBaseUrl)
+        buildConfigField "String", "NOTIFICATION_WEBHOOK_SECRET", JsonOutput.toJson(notificationSecret)
+    }
+    buildFeatures {
+        buildConfig true
     }
     buildTypes {
         release {
@@ -36,6 +46,7 @@ dependencies {
     implementation "androidx.coordinatorlayout:coordinatorlayout:$androidxCoordinatorLayoutVersion"
     implementation "androidx.core:core-splashscreen:$coreSplashScreenVersion"
     implementation project(':capacitor-android')
+    implementation "com.squareup.okhttp3:okhttp:4.12.0"
     testImplementation "junit:junit:$junitVersion"
     androidTestImplementation "androidx.test.ext:junit:$androidxJunitVersion"
     androidTestImplementation "androidx.test.espresso:espresso-core:$androidxEspressoCoreVersion"