chore: remove obsolete backup directories from March 2026

- Deleted backup_20260329_183359 (block height 2222, 3 accounts, 4 transactions)
- Deleted dependency_backup_20260331_204119 (pyproject.toml, requirements files)
- Deleted pre_deployment_20260402_120429 (config examples and environment templates)

backups/pre_deployment_20260402_120604/config/edge-node-aitbc.yaml

@@ -1,60 +0,0 @@
-# Edge Node Configuration - aitbc (Primary Container)
-edge_node_config:
-  node_id: "aitbc-edge-primary"
-  region: "us-east"
-  location: "primary-dev-container"
-  
-  services:
-    - name: "marketplace-api"
-      port: 8002
-      health_check: "/health/live"
-      enabled: true
-    - name: "cache-layer"
-      port: 6379
-      type: "redis"
-      enabled: true
-    - name: "monitoring-agent"
-      port: 9090
-      type: "prometheus"
-      enabled: true
-      
-  network:
-    cdn_integration: true
-    tcp_optimization: true
-    ipv6_support: true
-    bandwidth_mbps: 1000
-    latency_optimization: true
-    
-  resources:
-    cpu_cores: 8
-    memory_gb: 32
-    storage_gb: 500
-    gpu_access: false  # No GPU in containers
-    
-  caching:
-    redis_enabled: true
-    cache_ttl_seconds: 300
-    max_memory_mb: 1024
-    cache_strategy: "lru"
-    
-  monitoring:
-    metrics_enabled: true
-    health_check_interval: 30
-    performance_tracking: true
-    log_level: "info"
-    
-  security:
-    firewall_enabled: true
-    rate_limiting: true
-    ssl_termination: true
-    
-  load_balancing:
-    algorithm: "weighted_round_robin"
-    weight: 3
-    backup_nodes: ["aitbc1-edge-secondary"]
-    
-  performance_targets:
-    response_time_ms: 50
-    throughput_rps: 1000
-    cache_hit_rate: 0.9
-    error_rate: 0.01