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

TODO.md

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+# ESP32-Web TODO
+
+## API
+
+- [ ] Pagination for all list endpoints
+- [ ] Filter by date range
+- [ ] Sort options
+- [ ] OpenAPI/Swagger spec generation
+- [ ] Rate limiting (flask-limiter)
+- [ ] API authentication (JWT or API keys)
+
+## OSINT
+
+- [ ] IEEE OUI database download script
+- [ ] MAC vendor lookup on device creation
+- [ ] BLE company ID database
+- [ ] Device fingerprinting by advertisement patterns
+- [ ] SSID categorization (home, corporate, mobile hotspot)
+
+## Collector
+
+- [ ] Heartbeat timeout (mark sensor offline)
+- [ ] CSI data storage (optional, high volume)
+- [ ] Data retention policy (auto-cleanup old records)
+- [ ] Metrics collection (packets/sec, errors)
+
+## Fleet Management
+
+- [ ] Sensor config read/write
+- [ ] OTA orchestration
+- [ ] Calibration management
+- [ ] Bulk commands
+
+## Deployment
+
+- [ ] Systemd service file
+- [ ] PostgreSQL configuration
+- [ ] Nginx reverse proxy config
+- [ ] TLS setup guide
+- [ ] Backup/restore scripts
+
+## Testing
+
+- [ ] API endpoint tests (all routes)
+- [ ] Collector parser tests (edge cases)
+- [ ] Integration tests with mock sensors
+- [ ] Load testing
+
+## Ideas
+
+- WebSocket for live updates
+- SSE (Server-Sent Events) alternative
+- Webhook callbacks for alerts
+- Slack/Discord notifications
+- Home Assistant MQTT integration
+- Grafana dashboard templates
+- ML device classification