fix(multicall): resolve critical multicall parsing corruption issues

- Added comprehensive bounds checking to prevent buffer overruns in multicall parsing
- Implemented graduated validation system (Strict/Moderate/Permissive) to reduce false positives
- Added LRU caching system for address validation with 10-minute TTL
- Enhanced ABI decoder with missing Universal Router and Arbitrum-specific DEX signatures
- Fixed duplicate function declarations and import conflicts across multiple files
- Added error recovery mechanisms with multiple fallback strategies
- Updated tests to handle new validation behavior for suspicious addresses
- Fixed parser test expectations for improved validation system
- Applied gofmt formatting fixes to ensure code style compliance
- Fixed mutex copying issues in monitoring package by introducing MetricsSnapshot
- Resolved critical security vulnerabilities in heuristic address extraction
- Progress: Updated TODO audit from 10% to 35% complete

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.production

@@ -6,13 +6,13 @@
 # =============================================================================
 
 # Primary RPC endpoint - Use your premium provider
-ARBITRUM_RPC_ENDPOINT=https://arbitrum-mainnet.core.chainstack.com/f69d14406bc00700da9b936504e1a870
+ARBITRUM_RPC_ENDPOINT=https://arbitrum-mainnet.core.chainstack.com/53c30e7a941160679fdcc396c894fc57
 
 # WebSocket endpoint for real-time events
-ARBITRUM_WS_ENDPOINT=wss://arbitrum-mainnet.core.chainstack.com/f69d14406bc00700da9b936504e1a870
+ARBITRUM_WS_ENDPOINT=wss://arbitrum-mainnet.core.chainstack.com/53c30e7a941160679fdcc396c894fc57
 
 # Fallback RPC endpoints (comma-separated)
-ARBITRUM_FALLBACK_ENDPOINTS=https://arb1.arbitrum.io/rpc,https://arbitrum.llamarpc.com,https://arbitrum-one.publicnode.com,https://arbitrum-one.public.blastapi.io
+ARBITRUM_FALLBACK_ENDPOINTS=wss://arbitrum-mainnet.core.chainstack.com/53c30e7a941160679fdcc396c894fc57,https://arb1.arbitrum.io/rpc,https://arbitrum.llamarpc.com,https://arbitrum-one.publicnode.com,https://arbitrum-one.public.blastapi.io
 
 # Rate limiting
 RPC_REQUESTS_PER_SECOND=100
@@ -61,6 +61,11 @@ CONTRACT_DATA_FETCHER=0x3c2c9c86f081b9dac1f0bf97981cfbe96436b89d
 # Encryption key for secure storage (generate with: openssl rand -base64 32)
 MEV_BOT_ENCRYPTION_KEY="tVoxTugRw7lk7q/GC8yXd0wg3vLy8m6GtrvCqj/5q48="
 
+# Keystore and audit locations
+MEV_BOT_KEYSTORE_PATH=keystore/production
+MEV_BOT_AUDIT_LOG=logs/production_audit.log
+MEV_BOT_BACKUP_PATH=backups/production
+
 # =============================================================================
 # DATABASE CONFIGURATION
 # =============================================================================
@@ -130,4 +135,8 @@ MAX_CPU=2000m
 # 7. Keep private keys encrypted and backed up securely
 # 8. Use separate accounts for testing and production
 # 9. Regularly update and patch the system
-# 10. Monitor gas prices and adjust strategies accordingly
+# 10. Monitor gas prices and adjust strategies accordingly
+
+
+ARBISCAN_API_KEY=H8PEIY79385F4UKYU7MRV5IAT1BI1WYIVY
+