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/aitbc-env

@@ -1,53 +0,0 @@
-#!/bin/bash
-# AITBC Virtual Environment Wrapper
-# This script activates the central AITBC virtual environment
-
-# Check if venv exists
-if [ ! -d "/opt/aitbc/venv" ]; then
-    echo "❌ AITBC virtual environment not found at /opt/aitbc/venv"
-    echo "Run: sudo python3 -m venv /opt/aitbc/venv && pip install -r /opt/aitbc/requirements.txt"
-    exit 1
-fi
-
-# Activate the virtual environment
-source /opt/aitbc/venv/bin/activate
-
-# Set up environment (avoid aitbc-core logging conflict)
-export PYTHONPATH="/opt/aitbc/packages/py/aitbc-sdk/src:/opt/aitbc/packages/py/aitbc-crypto/src:$PYTHONPATH"
-export AITBC_VENV="/opt/aitbc/venv"
-export PATH="/opt/aitbc/venv/bin:$PATH"
-
-# Show status
-echo "✅ AITBC Virtual Environment Activated"
-echo "📍 Python: $(which python)"
-echo "📍 Pip: $(which pip)"
-echo "📦 Packages: $(pip list | wc -l) installed"
-
-# CLI alias function
-aitbc() {
-    if [ -f "/opt/aitbc/cli/core/main.py" ]; then
-        cd /opt/aitbc/cli
-        PYTHONPATH=/opt/aitbc/cli:/opt/aitbc/packages/py/aitbc-sdk/src:/opt/aitbc/packages/py/aitbc-crypto/src python -m core.main "$@"
-        cd - > /dev/null
-    else
-        echo "❌ AITBC CLI not found at /opt/aitbc/cli/core/main.py"
-        return 1
-    fi
-}
-
-# Execute command or start shell
-if [ $# -eq 0 ]; then
-    echo "🚀 Starting interactive shell..."
-    echo "💡 Use 'aitbc <command>' for CLI operations"
-    exec bash
-else
-    echo "🔧 Executing: $@"
-    if [ "$1" = "aitbc" ]; then
-        shift
-        cd /opt/aitbc/cli
-        PYTHONPATH=/opt/aitbc/cli:/opt/aitbc/packages/py/aitbc-sdk/src:/opt/aitbc/packages/py/aitbc-crypto/src python -m core.main "$@"
-        cd - > /dev/null
-    else
-        exec "$@"
-    fi
-fi