Fix 32-bit bcrypt ELFCLASS64 error and enhance installation

- Enhanced install_32bit.sh with clean virtual environment creation
- Added --force-reinstall and --clear flags for proper isolation
- Improved download_32bit_libs.sh with explicit armv7l targeting
- Added troubleshoot_32bit.sh for diagnosing 32-bit issues
- Better architecture verification and error messages
- Comprehensive package testing after installation

Fixes ELFCLASS64 error on 32-bit systems by ensuring proper
architecture isolation and clean package installation.

troubleshoot_32bit.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+# Troubleshooting script for 32-bit bcrypt issues
+
+echo "🔍 32-BIT SYSTEM TROUBLESHOOTING"
+echo "================================"
+
+# System info
+echo "1. System Information:"
+echo "   Architecture: $(uname -m)"
+echo "   OS: $(cat /etc/os-release | grep PRETTY_NAME | cut -d'"' -f2)"
+echo "   Python: $(python3 --version)"
+echo ""
+
+# Check if we're in virtual environment
+echo "2. Environment Check:"
+if [ -n "$VIRTUAL_ENV" ]; then
+    echo "   ✅ In virtual environment: $VIRTUAL_ENV"
+    echo "   Python location: $(which python)"
+    echo "   Pip location: $(which pip)"
+else
+    echo "   ❌ Not in virtual environment"
+    echo "   System Python: $(which python3)"
+fi
+echo ""
+
+# Check bcrypt installation
+echo "3. Bcrypt Investigation:"
+if [ -n "$VIRTUAL_ENV" ]; then
+    echo "   Checking installed bcrypt..."
+    pip list | grep bcrypt || echo "   ❌ bcrypt not installed"
+    
+    echo "   Testing bcrypt import..."
+    python3 -c "
+try:
+    import bcrypt
+    print('   ✅ bcrypt imports successfully')
+    
+    # Check bcrypt module location
+    print(f'   Module location: {bcrypt.__file__}')
+    
+    # Test basic functionality
+    test_pw = b'test123'
+    hashed = bcrypt.hashpw(test_pw, bcrypt.gensalt())
+    if bcrypt.checkpw(test_pw, hashed):
+        print('   ✅ bcrypt functionality works')
+    else:
+        print('   ❌ bcrypt functionality failed')
+        
+except ImportError as e:
+    print(f'   ❌ bcrypt import failed: {e}')
+except Exception as e:
+    print(f'   ❌ bcrypt error: {e}')
+"
+else
+    echo "   ⚠️  Please activate virtual environment first"
+fi
+
+echo ""
+echo "4. Library Files Check:"
+if [ -d "req_libraries_32bit" ]; then
+    echo "   ✅ req_libraries_32bit exists"
+    if ls req_libraries_32bit/bcrypt*.whl >/dev/null 2>&1; then
+        BCRYPT_FILE=$(ls req_libraries_32bit/bcrypt*.whl | head -1)
+        echo "   32-bit bcrypt: $(basename $BCRYPT_FILE)"
+        
+        # Quick check of wheel architecture
+        echo "   Checking wheel architecture..."
+        unzip -l "$BCRYPT_FILE" | grep "\.so" | head -1 || echo "   No .so files found"
+    else
+        echo "   ❌ No bcrypt wheel found in 32-bit libraries"
+    fi
+else
+    echo "   ❌ req_libraries_32bit folder missing"
+fi
+
+echo ""
+echo "5. Recommendations:"
+echo "   • Ensure you're on 32-bit Raspberry Pi OS (armv7l)"
+echo "   • Use: source .venv/bin/activate"
+echo "   • Run: ./install_32bit.sh for clean installation"
+echo "   • If still failing, remove .venv and reinstall"