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

.gitignore

@@ -0,0 +1,34 @@
+*.iml
+.gradle
+/local.properties
+.DS_Store
+/build
+*/build
+/captures
+.externalNativeBuild
+app/src/main/aidl/
+app/*.apk
+/.idea/
+
+# ignore jacoco coverage reports
+/coverage
+
+*.jks
+.java-version
+
+# ignore database schemas
+/core-db/schemas/io.novafoundation.nova.core_db.AppDatabase/*.json
+
+# database schemas exceptions
+!/core-db/schemas/io.novafoundation.nova.core_db.AppDatabase/1.json
+!/core-db/schemas/io.novafoundation.nova.core_db.AppDatabase/2.json
+!/core-db/schemas/io.novafoundation.nova.core_db.AppDatabase/8.json
+!/core-db/schemas/io.novafoundation.nova.core_db.AppDatabase/9.json
+
+# Firebase config - contains sensitive API keys
+google-services.json
+**/google-services.json
+
+# Version properties
+version.properties
+.kotlin/