Add example environment files for new node setup

examples/env.example

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+# AITBC Global Environment Configuration Template
+# Copy this file to /etc/aitbc/.env and customize for your deployment
+# This file contains global configuration shared across all nodes in the island
+
+# =========================
+# Core Environment
+# =========================
+NODE_ENV=production
+DEBUG=false
+LOG_LEVEL=INFO
+
+# =========================
+# Training Configuration  
+# =========================
+TRAINING_MODE=true
+TRAINING_STAGE=stage1_foundation
+CLI_PATH=/opt/aitbc/aitbc-cli
+LOG_DIR=/var/log/aitbc
+WALLET_NAME=openclaw-trainee
+WALLET_PASSWORD=trainee123
+
+# =========================
+# Service Ports (for training library)
+# =========================
+EXCHANGE_PORT=8000
+COORDINATOR_PORT=8001
+GENESIS_NODE_PORT=8006
+FOLLOWER_NODE_PORT=8007
+OLLAMA_PORT=11434
+
+# =========================
+# Blockchain Core
+# =========================
+chain_id=ait-testnet
+supported_chains=ait-testnet,ait-devnet
+db_path=/var/lib/aitbc/data/chain.db
+rpc_bind_host=0.0.0.0
+rpc_bind_port=8006
+p2p_bind_host=0.0.0.0
+p2p_bind_port=7070
+
+# =========================
+# Security
+# =========================
+SECRET_KEY=production-secret-key-change-me-in-production
+JWT_SECRET=production-jwt-secret-32-chars-long
+BLOCKCHAIN_API_KEY=production-api-key-change-me
+
+# =========================
+# Database
+# =========================
+DATABASE_URL=postgresql://aitbc:secure_password@localhost:5432/aitbc_prod
+REDIS_URL=redis://localhost:6379/0
+
+# =========================
+# Monitoring
+# =========================
+PROMETHEUS_PORT=9090
+GRAFANA_PORT=3000
+MONITORING_PORT=9000
+
+# =========================
+# Paths
+# =========================
+BLOCKCHAIN_DATA_DIR=/var/lib/aitbc/data
+BLOCKCHAIN_CONFIG_DIR=/etc/aitbc
+BLOCKCHAIN_LOG_DIR=/var/log/aitbc/production
+keystore_path=/var/lib/aitbc/keystore
+keystore_password_file=/var/lib/aitbc/keystore/.password
+
+# =========================
+# Block Production
+# =========================
+enable_block_production=true
+block_time_seconds=30
+proposer_id=ait1ytkh0cn8v2a4zjwzyav6854832myf9j7unsse8yntmuwzst4qhtqe9hqdw
+
+# Only propose blocks if mempool is not empty
+propose_only_if_mempool_not_empty=true
+
+# =========================
+# Network Configuration
+# =========================
+NETWORK_ID=1337
+CHAIN_ID=ait-testnet
+CONSENSUS=proof_of_authority
+gossip_backend=broadcast
+gossip_broadcast_url=redis://localhost:6379
+
+# =========================
+# NAT Traversal (STUN/TURN)
+# =========================
+STUN_SERVERS=stun.l.google.com:19302,jitsi.bubuit.net:3478
+TURN_SERVER=jitsi.bubuit.net:3478
+# TURN_USERNAME and TURN_PASSWORD need to be configured if using TURN relay
+
+# =========================
+# Island Configuration (Federated Mesh)
+# =========================
+ISLAND_ID=test-island-001
+ISLAND_NAME=Test Island
+IS_HUB=true
+ISLAND_CHAIN_ID=ait-testnet
+HUB_DISCOVERY_URL=aitbc
+BRIDGE_ISLANDS=
+
+# =========================
+# API Configuration
+# =========================
+API_VERSION=v1
+API_PREFIX=/api/v1
+RATE_LIMIT_REQUESTS_PER_MINUTE=1000
+RATE_LIMIT_WINDOW_SECONDS=60
+
+# =========================
+# Feature Flags
+# =========================
+ENABLE_CACHING=true
+ENABLE_METRICS=true
+ENABLE_LOGGING=true
+ENABLE_SECURITY_MONITORING=true
+
+# =========================
+# Training Specific
+# =========================
+TRAINING_TIMEOUT=300
+GENESIS_NODE=http://localhost:8006
+FOLLOWER_NODE=http://localhost:8007