Initial commit: Pezkuwi Wallet Android

Security hardened release:
- Code obfuscation enabled (minifyEnabled=true, shrinkResources=true)
- Sensitive files excluded (google-services.json, keystores)
- Branch.io key moved to BuildConfig placeholder
- Updated dependencies: OkHttp 4.12.0, Gson 2.10.1, BouncyCastle 1.77
- Comprehensive ProGuard rules for crypto wallet
- Navigation 2.7.7, Lifecycle 2.7.0, ConstraintLayout 2.1.4

allmodules.gradle

@@ -0,0 +1,37 @@
+def APP_MODULE = 'app'
+
+subprojects {
+    if (!file("$projectDir/build.gradle").exists()) {
+        return
+    }
+
+    if (APP_MODULE == project.name) {
+        apply plugin: 'com.android.application'
+    } else {
+        apply plugin: 'com.android.library'
+    }
+
+    apply plugin: 'kotlin-android'
+    apply plugin: "com.google.devtools.ksp"
+
+    android {
+        compileSdkVersion rootProject.compileSdkVersion
+
+        defaultConfig {
+            minSdkVersion rootProject.minSdkVersion
+            targetSdkVersion rootProject.targetSdkVersion
+
+            testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        }
+
+        compileOptions {
+            sourceCompatibility JavaVersion.VERSION_17
+            targetCompatibility JavaVersion.VERSION_17
+        }
+
+        kotlinOptions {
+            jvmTarget = JavaVersion.VERSION_17.toString()
+            freeCompilerArgs = ["-Xcontext-receivers"]
+        }
+    }
+}