feat: add Firebase basic configuration for push notifications (#391)

* Add Firebase configuration for push notifications

* Add Firebase Linux compatibility documentation and notes

* Add comprehensive FCM implementation documentation

* Update Firebase dependencies to latest versions

* Update mostro-push-server repository URL to organization account

* Update FCM implementation documentation with phase completion status

* Add detailed MIP-05 implementation comparison and privacy analysis

Author: AndreaDiazCorreia

.firebaserc

@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "mostro-mobile"
+  }
+}

.gitignore

@@ -45,9 +45,7 @@ android/app/upload-keystore.jks
 *.apk
 .cxx/
 
-# Firebase and Google Services
-android/app/google-services.json
-ios/Runner/GoogleService-Info.plist
+# Firebase and Google Services (public credentials - safe to commit)
 
 # Web
 web/.dart_tool/

android/app/build.gradle

@@ -1,5 +1,8 @@
 plugins {
     id "com.android.application"
+    // START: FlutterFire Configuration
+    id 'com.google.gms.google-services'
+    // END: FlutterFire Configuration
     id "kotlin-android"
     // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id "dev.flutter.flutter-gradle-plugin"

android/app/google-services.json

@@ -0,0 +1,29 @@
+{
+  "project_info": {
+    "project_number": "375342057498",
+    "project_id": "mostro-mobile",
+    "storage_bucket": "mostro-mobile.firebasestorage.app"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:375342057498:android:4ef7011ab12de38e86e9a3",
+        "android_client_info": {
+          "package_name": "network.mostro.app"
+        }
+      },
+      "oauth_client": [],
+      "api_key": [
+        {
+          "current_key": "AIzaSyCOrsfYrkIItBLAFbnYmh4HnsxBTnT3y14"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": []
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}

android/settings.gradle

@@ -19,6 +19,9 @@ pluginManagement {
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
     id "com.android.application" version "8.6.0" apply false
+    // START: FlutterFire Configuration
+    id "com.google.gms.google-services" version "4.4.4" apply false
+    // END: FlutterFire Configuration
     id "org.jetbrains.kotlin.android" version "2.1.0" apply false
 }