feat: implement AITBC mesh network deployment infrastructure

✅ Phase 0: Pre-implementation checklist completed
- Environment configurations (dev/staging/production)
- Directory structure setup (logs, backups, monitoring)
- Virtual environment with dependencies

✅ Master deployment script created
- Single command deployment with validation
- Progress tracking and rollback capability
- Health checks and deployment reporting

✅ Validation script created
- Module import validation
- Basic functionality testing
- Configuration and script verification

✅ Implementation fixes
- Fixed dataclass import in consensus keys
- Fixed async function syntax in tests
- Updated deployment script for virtual environment

🚀 Ready for deployment: ./scripts/deploy-mesh-network.sh dev

apps/blockchain-node/tests/consensus/test_multi_validator_poa.py

@@ -0,0 +1,166 @@
+"""
+Tests for Multi-Validator PoA Consensus
+"""
+
+import pytest
+import asyncio
+from unittest.mock import Mock, patch
+
+from aitbc_chain.consensus.multi_validator_poa import MultiValidatorPoA, ValidatorRole
+
+class TestMultiValidatorPoA:
+    """Test cases for multi-validator PoA consensus"""
+    
+    def setup_method(self):
+        """Setup test environment"""
+        self.consensus = MultiValidatorPoA("test-chain")
+        
+        # Add test validators
+        self.validator_addresses = [
+            "0x1234567890123456789012345678901234567890",
+            "0x2345678901234567890123456789012345678901",
+            "0x3456789012345678901234567890123456789012",
+            "0x4567890123456789012345678901234567890123",
+            "0x5678901234567890123456789012345678901234"
+        ]
+        
+        for address in self.validator_addresses:
+            self.consensus.add_validator(address, 1000.0)
+    
+    def test_add_validator(self):
+        """Test adding a new validator"""
+        new_validator = "0x6789012345678901234567890123456789012345"
+        
+        result = self.consensus.add_validator(new_validator, 1500.0)
+        assert result is True
+        assert new_validator in self.consensus.validators
+        assert self.consensus.validators[new_validator].stake == 1500.0
+    
+    def test_add_duplicate_validator(self):
+        """Test adding duplicate validator fails"""
+        result = self.consensus.add_validator(self.validator_addresses[0], 2000.0)
+        assert result is False
+    
+    def test_remove_validator(self):
+        """Test removing a validator"""
+        validator_to_remove = self.validator_addresses[0]
+        
+        result = self.consensus.remove_validator(validator_to_remove)
+        assert result is True
+        assert not self.consensus.validators[validator_to_remove].is_active
+        assert self.consensus.validators[validator_to_remove].role == ValidatorRole.STANDBY
+    
+    def test_remove_nonexistent_validator(self):
+        """Test removing non-existent validator fails"""
+        result = self.consensus.remove_validator("0xnonexistent")
+        assert result is False
+    
+    def test_select_proposer_round_robin(self):
+        """Test round-robin proposer selection"""
+        # Set all validators as proposers
+        for address in self.validator_addresses:
+            self.consensus.validators[address].role = ValidatorRole.PROPOSER
+        
+        # Test proposer selection for different heights
+        proposer_0 = self.consensus.select_proposer(0)
+        proposer_1 = self.consensus.select_proposer(1)
+        proposer_2 = self.consensus.select_proposer(2)
+        
+        assert proposer_0 in self.validator_addresses
+        assert proposer_1 in self.validator_addresses
+        assert proposer_2 in self.validator_addresses
+        assert proposer_0 != proposer_1
+        assert proposer_1 != proposer_2
+    
+    def test_select_proposer_no_validators(self):
+        """Test proposer selection with no active validators"""
+        # Deactivate all validators
+        for address in self.validator_addresses:
+            self.consensus.validators[address].is_active = False
+        
+        proposer = self.consensus.select_proposer(0)
+        assert proposer is None
+    
+    def test_validate_block_valid_proposer(self):
+        """Test block validation with valid proposer"""
+        from aitbc_chain.models import Block
+        
+        # Set first validator as proposer
+        proposer = self.validator_addresses[0]
+        self.consensus.validators[proposer].role = ValidatorRole.PROPOSER
+        
+        # Create mock block
+        block = Mock(spec=Block)
+        block.hash = "0xblockhash"
+        block.height = 1
+        
+        result = self.consensus.validate_block(block, proposer)
+        assert result is True
+    
+    def test_validate_block_invalid_proposer(self):
+        """Test block validation with invalid proposer"""
+        from aitbc_chain.models import Block
+        
+        # Create mock block
+        block = Mock(spec=Block)
+        block.hash = "0xblockhash"
+        block.height = 1
+        
+        # Try to validate with non-existent validator
+        result = self.consensus.validate_block(block, "0xnonexistent")
+        assert result is False
+    
+    def test_get_consensus_participants(self):
+        """Test getting consensus participants"""
+        # Set first 3 validators as active
+        for i, address in enumerate(self.validator_addresses[:3]):
+            self.consensus.validators[address].role = ValidatorRole.PROPOSER if i == 0 else ValidatorRole.VALIDATOR
+            self.consensus.validators[address].is_active = True
+        
+        # Set remaining validators as standby
+        for address in self.validator_addresses[3:]:
+            self.consensus.validators[address].role = ValidatorRole.STANDBY
+            self.consensus.validators[address].is_active = False
+        
+        participants = self.consensus.get_consensus_participants()
+        assert len(participants) == 3
+        assert self.validator_addresses[0] in participants
+        assert self.validator_addresses[1] in participants
+        assert self.validator_addresses[2] in participants
+        assert self.validator_addresses[3] not in participants
+    
+    def test_update_validator_reputation(self):
+        """Test updating validator reputation"""
+        validator = self.validator_addresses[0]
+        initial_reputation = self.consensus.validators[validator].reputation
+        
+        # Increase reputation
+        result = self.consensus.update_validator_reputation(validator, 0.1)
+        assert result is True
+        assert self.consensus.validators[validator].reputation == initial_reputation + 0.1
+        
+        # Decrease reputation
+        result = self.consensus.update_validator_reputation(validator, -0.2)
+        assert result is True
+        assert self.consensus.validators[validator].reputation == initial_reputation - 0.1
+        
+        # Try to update non-existent validator
+        result = self.consensus.update_validator_reputation("0xnonexistent", 0.1)
+        assert result is False
+    
+    def test_reputation_bounds(self):
+        """Test reputation stays within bounds [0.0, 1.0]"""
+        validator = self.validator_addresses[0]
+        
+        # Try to increase beyond 1.0
+        result = self.consensus.update_validator_reputation(validator, 0.5)
+        assert result is True
+        assert self.consensus.validators[validator].reputation == 1.0
+        
+        # Try to decrease below 0.0
+        result = self.consensus.update_validator_reputation(validator, -1.5)
+        assert result is True
+        assert self.consensus.validators[validator].reputation == 0.0
+
+if __name__ == "__main__":
+    pytest.main([__file__])