Add Dangerous Pi MVP implementation - complete backend and system integration

This commit adds the complete Dangerous Pi web management interface with all MVP features implemented and tested locally.

## New Features

### Backend (Python + FastAPI)
- Complete FastAPI backend with async support
- 40+ API endpoints (Health, PM3, WiFi, Updates, UPS, BLE, Plugins)
- 6 managers: Session, WiFi, Update, UPS, BLE, Plugin
- SQLite database with sessions, config, history, crash reports
- Server-Sent Events (SSE) for real-time notifications
- Mock PM3 worker for development without hardware

### WiFi Manager
- Interface detection (USB vs built-in)
- Network scanning with signal strength
- Mode switching (AP/Client/Dual/Auto/Off)
- Network connection with password support
- Hidden SSID and saved networks support
- Static IP and DHCP configuration
- 10 WiFi API endpoints

### Update Manager
- GitHub releases API integration
- Automatic periodic update checks
- Semantic version comparison
- Update download with progress tracking
- SHA256 checksum verification
- Automatic installation with backup and rollback
- PM3 client rebuild after updates
- 6 Update API endpoints

### UPS Manager
- I2C battery monitoring (MAX17040-compatible)
- Battery percentage, voltage, current tracking
- Power source detection (AC/Battery)
- Safe shutdown triggers at configurable thresholds
- Event callbacks for battery warnings
- SSE and BLE notification integration
- 3 UPS API endpoints

### BLE Manager
- Bluetooth Low Energy notification support
- Auto-detects BLE capability
- Multiple notification types (updates, battery, shutdown, etc.)
- BLE advertising management
- Device connection tracking
- 4 BLE API endpoints

### Plugin Framework
- Dynamic plugin loading/unloading
- Plugin lifecycle management (load, enable, disable, unload)
- Hook system for extensibility
- JSON-based metadata
- Example "Hello World" plugin included
- 7 Plugin API endpoints

### Frontend (Remix.js + React)
- Cyberpunk-themed responsive UI
- Dashboard with system status
- PM3 command interface with history
- Settings page with WiFi and Update management
- Command logs viewer
- Theme toggle (Dark/Light/Auto)
- Server-side rendering (SSR)
- Mobile-first responsive design

### System Integration
- Systemd service with security hardening
- Automated install/uninstall scripts
- Environment configuration template
- Hardware access groups (i2c, bluetooth, gpio, dialout)
- Pi-gen stage 04 integration for OS image building
- Port conflict resolution with ttyd-bash
- I2C interface auto-enable for UPS HAT

### Testing
- test_backend.py - Backend API tests
- test_ups.py - UPS manager tests
- test_ble.py - BLE manager tests
- test_plugins.py - Plugin manager tests
- All tests passing locally

### Documentation
- 12 comprehensive documentation files
- claude.md - AI development guide
- WIFI_MANAGER.md - WiFi management guide
- UPDATE_MANAGER.md - Update system guide
- PORT_CONFLICT.md - Port conflict resolution guide
- MVP_COMPLETE.md - MVP implementation summary
- PROJECT_STATUS.md - Project status and roadmap
- systemd/README.md - Service management docs
- pi-gen integration documentation

## Technical Details
- ~5,000+ lines of backend code
- 11 Python dependencies (smbus2 added for UPS)
- FastAPI with async/await throughout
- Type hints and docstrings on all functions
- RESTful API design with SSE for notifications
- Security hardening (non-root, protected dirs, resource limits)

## Next Steps
- Deploy to Raspberry Pi Zero 2 W hardware
- Test with real Proxmark3 device
- Test UPS HAT integration
- Test BLE on Pi hardware
- Build custom OS image with pi-gen
- Performance optimization for Pi Zero 2 W

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/resolve-port-conflict.sh

@@ -0,0 +1,114 @@
+#!/bin/bash
+# Script to resolve port conflict between Dangerous Pi and ttyd-bash
+
+set -e
+
+echo "Dangerous Pi Port Conflict Resolution"
+echo "======================================"
+echo ""
+echo "The existing pi-pm3 setup uses:"
+echo "  - ttyd-bash on port 8000"
+echo "  - ttyd-pm3 on port 8080"
+echo "  - RaspAP on port 80"
+echo ""
+echo "Dangerous Pi wants to use port 8000 for the backend."
+echo ""
+echo "Choose a resolution option:"
+echo "  1) Disable ttyd-bash (recommended - use Dangerous Pi's web terminal instead)"
+echo "  2) Change Dangerous Pi to port 8001 (keep both services)"
+echo "  3) Change ttyd-bash to port 8002 (keep both services)"
+echo "  4) Cancel (manual configuration)"
+echo ""
+
+read -p "Enter option (1-4): " option
+
+case $option in
+    1)
+        echo ""
+        echo "Disabling ttyd-bash service..."
+
+        if systemctl is-active --quiet ttyd-bash 2>/dev/null; then
+            sudo systemctl stop ttyd-bash
+            echo "✅ Stopped ttyd-bash"
+        fi
+
+        if systemctl is-enabled --quiet ttyd-bash 2>/dev/null; then
+            sudo systemctl disable ttyd-bash
+            echo "✅ Disabled ttyd-bash (won't start on boot)"
+        fi
+
+        echo ""
+        echo "✅ Done! Dangerous Pi can now use port 8000."
+        echo ""
+        echo "To re-enable ttyd-bash later:"
+        echo "  sudo systemctl enable ttyd-bash"
+        echo "  sudo systemctl start ttyd-bash"
+        ;;
+
+    2)
+        echo ""
+        echo "Changing Dangerous Pi to port 8001..."
+
+        # Update environment file
+        if [ -f /opt/dangerous-pi/.env ]; then
+            if grep -q "^PORT=" /opt/dangerous-pi/.env; then
+                sudo sed -i 's/^PORT=.*/PORT=8001/' /opt/dangerous-pi/.env
+            else
+                echo "PORT=8001" | sudo tee -a /opt/dangerous-pi/.env
+            fi
+            echo "✅ Updated /opt/dangerous-pi/.env"
+        else
+            echo "⚠️  Environment file not found. Please edit manually."
+        fi
+
+        # Restart service if running
+        if systemctl is-active --quiet dangerous-pi 2>/dev/null; then
+            sudo systemctl restart dangerous-pi
+            echo "✅ Restarted dangerous-pi service"
+        fi
+
+        echo ""
+        echo "✅ Done! Dangerous Pi now uses port 8001."
+        echo "   Access at: http://$(hostname -I | awk '{print $1}'):8001"
+        ;;
+
+    3)
+        echo ""
+        echo "Changing ttyd-bash to port 8002..."
+
+        # Find and update ttyd-bash service file
+        if [ -f /etc/systemd/system/ttyd-bash.service ]; then
+            sudo sed -i 's/--port 8000/--port 8002/' /etc/systemd/system/ttyd-bash.service
+            sudo systemctl daemon-reload
+            echo "✅ Updated ttyd-bash service"
+
+            if systemctl is-active --quiet ttyd-bash 2>/dev/null; then
+                sudo systemctl restart ttyd-bash
+                echo "✅ Restarted ttyd-bash"
+            fi
+
+            echo ""
+            echo "✅ Done! ttyd-bash now uses port 8002."
+            echo "   ttyd-bash: http://$(hostname -I | awk '{print $1}'):8002"
+            echo "   Dangerous Pi can use port 8000"
+        else
+            echo "⚠️  ttyd-bash service file not found. Please configure manually."
+        fi
+        ;;
+
+    4)
+        echo ""
+        echo "Cancelled. Manual configuration required."
+        echo ""
+        echo "Configuration files:"
+        echo "  - Dangerous Pi: /opt/dangerous-pi/.env (PORT variable)"
+        echo "  - ttyd-bash: /etc/systemd/system/ttyd-bash.service"
+        ;;
+
+    *)
+        echo "Invalid option. Exiting."
+        exit 1
+        ;;
+esac
+
+echo ""