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/src/aitbc_chain/consensus/slashing.py

@@ -0,0 +1,138 @@
+"""
+Slashing Conditions Implementation
+Handles detection and penalties for validator misbehavior
+"""
+
+import time
+from typing import Dict, List, Optional, Set
+from dataclasses import dataclass
+from enum import Enum
+
+from .multi_validator_poa import Validator, ValidatorRole
+
+class SlashingCondition(Enum):
+    DOUBLE_SIGN = "double_sign"
+    UNAVAILABLE = "unavailable"
+    INVALID_BLOCK = "invalid_block"
+    SLOW_RESPONSE = "slow_response"
+
+@dataclass
+class SlashingEvent:
+    validator_address: str
+    condition: SlashingCondition
+    evidence: str
+    block_height: int
+    timestamp: float
+    slash_amount: float
+
+class SlashingManager:
+    """Manages validator slashing conditions and penalties"""
+    
+    def __init__(self):
+        self.slashing_events: List[SlashingEvent] = []
+        self.slash_rates = {
+            SlashingCondition.DOUBLE_SIGN: 0.5,      # 50% slash
+            SlashingCondition.UNAVAILABLE: 0.1,      # 10% slash
+            SlashingCondition.INVALID_BLOCK: 0.3,     # 30% slash
+            SlashingCondition.SLOW_RESPONSE: 0.05    # 5% slash
+        }
+        self.slash_thresholds = {
+            SlashingCondition.DOUBLE_SIGN: 1,         # Immediate slash
+            SlashingCondition.UNAVAILABLE: 3,        # After 3 offenses
+            SlashingCondition.INVALID_BLOCK: 1,       # Immediate slash
+            SlashingCondition.SLOW_RESPONSE: 5       # After 5 offenses
+        }
+    
+    def detect_double_sign(self, validator: str, block_hash1: str, block_hash2: str, height: int) -> Optional[SlashingEvent]:
+        """Detect double signing (validator signed two different blocks at same height)"""
+        if block_hash1 == block_hash2:
+            return None
+        
+        return SlashingEvent(
+            validator_address=validator,
+            condition=SlashingCondition.DOUBLE_SIGN,
+            evidence=f"Double sign detected: {block_hash1} vs {block_hash2} at height {height}",
+            block_height=height,
+            timestamp=time.time(),
+            slash_amount=self.slash_rates[SlashingCondition.DOUBLE_SIGN]
+        )
+    
+    def detect_unavailability(self, validator: str, missed_blocks: int, height: int) -> Optional[SlashingEvent]:
+        """Detect validator unavailability (missing consensus participation)"""
+        if missed_blocks < self.slash_thresholds[SlashingCondition.UNAVAILABLE]:
+            return None
+        
+        return SlashingEvent(
+            validator_address=validator,
+            condition=SlashingCondition.UNAVAILABLE,
+            evidence=f"Missed {missed_blocks} consecutive blocks",
+            block_height=height,
+            timestamp=time.time(),
+            slash_amount=self.slash_rates[SlashingCondition.UNAVAILABLE]
+        )
+    
+    def detect_invalid_block(self, validator: str, block_hash: str, reason: str, height: int) -> Optional[SlashingEvent]:
+        """Detect invalid block proposal"""
+        return SlashingEvent(
+            validator_address=validator,
+            condition=SlashingCondition.INVALID_BLOCK,
+            evidence=f"Invalid block {block_hash}: {reason}",
+            block_height=height,
+            timestamp=time.time(),
+            slash_amount=self.slash_rates[SlashingCondition.INVALID_BLOCK]
+        )
+    
+    def detect_slow_response(self, validator: str, response_time: float, threshold: float, height: int) -> Optional[SlashingEvent]:
+        """Detect slow consensus participation"""
+        if response_time <= threshold:
+            return None
+        
+        return SlashingEvent(
+            validator_address=validator,
+            condition=SlashingCondition.SLOW_RESPONSE,
+            evidence=f"Slow response: {response_time}s (threshold: {threshold}s)",
+            block_height=height,
+            timestamp=time.time(),
+            slash_amount=self.slash_rates[SlashingCondition.SLOW_RESPONSE]
+        )
+    
+    def apply_slashing(self, validator: Validator, event: SlashingEvent) -> bool:
+        """Apply slashing penalty to validator"""
+        slash_amount = validator.stake * event.slash_amount
+        validator.stake -= slash_amount
+        
+        # Demote validator role if stake is too low
+        if validator.stake < 100:  # Minimum stake threshold
+            validator.role = ValidatorRole.STANDBY
+        
+        # Record slashing event
+        self.slashing_events.append(event)
+        
+        return True
+    
+    def get_validator_slash_count(self, validator_address: str, condition: SlashingCondition) -> int:
+        """Get count of slashing events for validator and condition"""
+        return len([
+            event for event in self.slashing_events
+            if event.validator_address == validator_address and event.condition == condition
+        ])
+    
+    def should_slash(self, validator: str, condition: SlashingCondition) -> bool:
+        """Check if validator should be slashed for condition"""
+        current_count = self.get_validator_slash_count(validator, condition)
+        threshold = self.slash_thresholds.get(condition, 1)
+        return current_count >= threshold
+    
+    def get_slashing_history(self, validator_address: Optional[str] = None) -> List[SlashingEvent]:
+        """Get slashing history for validator or all validators"""
+        if validator_address:
+            return [event for event in self.slashing_events if event.validator_address == validator_address]
+        return self.slashing_events.copy()
+    
+    def calculate_total_slashed(self, validator_address: str) -> float:
+        """Calculate total amount slashed for validator"""
+        events = self.get_slashing_history(validator_address)
+        return sum(event.slash_amount for event in events)
+
+# Global slashing manager
+slashing_manager = SlashingManager()