docs: Add project documentation

- README.md: Quick start, API endpoints, ports
- PROJECT.md: Architecture, components, data models
- ROADMAP.md: Version milestones (v0.1.x - v1.0.0)
- TASKS.md: Current sprint tasks
- TODO.md: Backlog items
- docs/INSTALL.md: Setup and deployment
- docs/USAGE.md: API examples
- docs/CHEATSHEET.md: Quick reference

docs/CHEATSHEET.md

@@ -0,0 +1,97 @@
+# ESP32-Web Cheatsheet
+
+## Server Management
+
+```bash
+make start      # Start server
+make stop       # Stop server
+make restart    # Restart server
+make status     # Show PID + uptime
+make logs       # Tail logs
+make dev        # Run with debug mode
+```
+
+## Database
+
+```bash
+make migrate              # Apply migrations
+make migrate-init         # Initialize migrations
+make migrate-create msg="description"  # Create migration
+```
+
+## Testing
+
+```bash
+make test       # Run all tests
+pytest -v       # Verbose output
+pytest -k test_sensors  # Run specific tests
+```
+
+## Container
+
+```bash
+make build          # Build image
+make container-run  # Run container
+make container-stop # Stop container
+make container-logs # View logs
+```
+
+## API Quick Reference
+
+```bash
+# Health
+curl localhost:5500/health
+
+# Sensors
+curl localhost:5500/api/v1/sensors
+curl localhost:5500/api/v1/sensors/HOSTNAME
+curl -X POST localhost:5500/api/v1/sensors/HOSTNAME/command -H "Content-Type: application/json" -d '{"command":"STATUS"}'
+
+# Devices
+curl localhost:5500/api/v1/devices
+curl "localhost:5500/api/v1/devices?type=ble&limit=50"
+curl localhost:5500/api/v1/devices/MAC
+
+# Alerts
+curl localhost:5500/api/v1/alerts
+curl "localhost:5500/api/v1/alerts?type=deauth&hours=48"
+
+# Events
+curl localhost:5500/api/v1/events
+curl "localhost:5500/api/v1/events?type=presence"
+
+# Probes
+curl localhost:5500/api/v1/probes
+curl localhost:5500/api/v1/probes/ssids
+
+# Stats
+curl localhost:5500/api/v1/stats
+```
+
+## Query Parameters
+
+| Parameter | Endpoints | Description |
+|-----------|-----------|-------------|
+| type | devices, alerts, events | Filter by type |
+| hours | alerts, events, probes | Time window (default: 24) |
+| limit | devices, alerts, events, probes | Max results (default: 100) |
+| offset | devices, alerts, events, probes | Skip N results |
+| ssid | probes | Filter by SSID |
+| sensor_id | alerts, events | Filter by sensor |
+
+## Files
+
+| File | Description |
+|------|-------------|
+| `/tmp/esp32-web.pid` | Server PID file |
+| `/tmp/esp32-web.log` | Server log file |
+| `instance/esp32.db` | SQLite database |
+| `.env` | Environment config |
+
+## Ports
+
+| Port | Protocol | Description |
+|------|----------|-------------|
+| 5500 | TCP | HTTP API |
+| 5500 | UDP | Sensor data |
+| 5501 | UDP | Sensor commands |