Update NEAR integration and configuration settings

- Updated .env.example to reflect the new default LLM model: meta-llama/llama-3.3-70B-instruct.
- Enhanced test_transaction.py with improved logging, environment variable validation, and error handling during NEAR transactions.
- Refactored near_integration.py to utilize near-api-py for more efficient transaction handling and account management.
- Simplified NEAR connection creation and error handling, ensuring better feedback during transaction processes.

.env.example

@@ -7,44 +7,7 @@ NEAR_RPC_URL=https://neart.lava.build
 # LLM Configuration (Required)
 LLM_PROVIDER=hyperbolic  # Currently supported: hyperbolic
 LLM_API_KEY=your-llm-api-key  # Get from https://hyperbolic.xyz
-LLM_MODEL=deepseek-ai/DeepSeek-V3  # Default LLM model
+LLM_MODEL=meta-llama/llama-3.3-70B-instruct  # Default LLM model
 LLM_TEMPERATURE=0.7  # Lower for more deterministic responses
 LLM_MAX_TOKENS=2000  # Maximum response length
 LLM_API_URL=https://api.hyperbolic.xyz/v1
-
-# Market Data Configuration (Optional)
-DEFILLAMA_API_KEY=your-defillama-key  # For additional market data
-MARKET_DATA_CACHE_TTL=300  # Cache lifetime in seconds
-
-# Memory and Storage (Optional)
-REDIS_URL=redis://localhost:6379  # For distributed setups
-MAX_MEMORY_ENTRIES=1000  # Maximum entries in memory
-MEMORY_PRUNING_THRESHOLD=0.8  # Prune when 80% full
-
-# Monitoring and Logging (Optional)
-LOG_LEVEL=INFO  # DEBUG, INFO, WARNING, ERROR
-PROMETHEUS_PORT=9090  # For metrics
-ENABLE_TELEMETRY=true  # Send anonymous usage data
-
-# Strategy Configuration (Optional)
-MIN_PROFIT_THRESHOLD=0.002  # 0.2% minimum profit
-MAX_POSITION_SIZE=10000  # Maximum position size in USD
-GAS_PRICE_THRESHOLD=0.001  # Maximum acceptable gas price
-CONSENSUS_THRESHOLD=0.7  # Required agreement among agents
-
-# Security and Risk Management (Optional)
-MAX_SLIPPAGE=0.01  # 1% maximum slippage
-RATE_LIMIT_TRADES=10  # Max trades per minute
-EMERGENCY_SHUTDOWN_THRESHOLD=0.05  # 5% unexpected loss
-
-# Development Settings (Optional)
-ENABLE_DEBUG_MODE=false  # Enable additional debugging
-TEST_MODE=false  # Use mock data for testing
-
-# Voice Synthesis (ElevenLabs)
-ELEVEN_LABS_API_KEY=your-elevenlabs-api-key
-ELEVEN_LABS_VOICE_ID=ThT5KcBeYPX3keUQqHPh  # Default voice ID
-
-# USDC Configuration
-USDC_CONTRACT_TESTNET=usdc.testnet
-USDC_CONTRACT_MAINNET=usdc.near