[FEATURE] Add multi-wallet support (Rabet, xBull, LOBSTR)

Author: Emmzyemms

.env.example

@@ -0,0 +1,41 @@
+# Stellar Goal Vault Environment Variables Example
+# Copy this file to .env and fill in the actual values
+
+# Server Configuration
+PORT=3000
+NODE_ENV=development
+
+# Stellar Network Configuration
+NETWORK_PASSPHRASE=Test SDF Network ; September 2015
+SOROBAN_RPC_URL=https://soroban-testnet.stellar.org:443
+
+# Contract IDs (automatically updated by CI/CD)
+TESTNET_CONTRACT_ID=
+STAGING_CONTRACT_ID=
+MAINNET_CONTRACT_ID=
+
+# Stellar Account Configuration
+# The secret key for the server account used for contract operations
+SERVER_PRIVATE_KEY=
+
+# Wallet Integration
+WALLET_INTEGRATION_READY=true
+CONTRACT_AMOUNT_DECIMALS=7
+
+# Asset Addresses (Soroban contract addresses for supported assets)
+# Format: ASSET_CODE=contract_address
+XLM=
+USDC=
+EURC=
+
+# Allowed Assets for Campaigns
+ALLOWED_ASSETS=XLM,USDC,EURC
+
+# Database Configuration (if using a database)
+# DATABASE_URL=
+
+# CORS Configuration
+# CORS_ORIGIN=*
+
+# Logging
+LOG_LEVEL=info