Complete Pezkuwi rebrand for Play Store release

User-visible changes:
- All strings.xml: Nova → Pezkuwi (12 languages, 721 references)
- App name: Pezkuwi Wallet
- Deep links: pezkuwiwallet://
- WalletConnect: Pezkuwi Wallet metadata
- Backup files: pezkuwiwallet_backup.json
- Push notifications: Pezkuwi Wallet branding

Technical changes:
- Gradle namespaces: io.pezkuwichain.wallet.*
- JS interface prefix: Pezkuwi_*
- User-Agent: Pezkuwi Wallet (Android)
- Firebase: pezkuwi-wallet project config

Assets:
- Nevroz fire logo (Kurdish colors theme)
- 6 density PNG files

Documentation:
- PACKAGE_STRUCTURE_REBRAND.md for future refactoring

feature-wallet-impl/build.gradle

@@ -25,7 +25,7 @@ android {
             buildConfigField "String", "DYNAMIC_CROSS_CHAIN_CONFIG_URL", "\"https://raw.githubusercontent.com/pezkuwichain/pezkuwi-wallet-utils/master/xcm/v8/transfers_dynamic.json\""
         }
     }
-    namespace 'io.novafoundation.nova.feature_wallet_impl'
+    namespace 'io.pezkuwichain.wallet.feature_wallet_impl'
 
     buildFeatures {
         viewBinding true