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

tests.gradle

@@ -0,0 +1,14 @@
+afterEvaluate {
+    task runModuleTests {
+        Task runTestsTask
+        if (project.tasks.findByName('testDevelopDebugUnitTest')) {
+            runTestsTask = project.tasks.findByName('testDevelopDebugUnitTest')
+        } else {
+            runTestsTask = project.tasks.findByName('testDebugUnitTest')
+        }
+
+        dependsOn runTestsTask
+
+        group "Verification"
+    }
+}