feat: WinDHCPD — Windows-native DHCP server

Python 3 + Scapy DHCP server with:
- Full DORA handshake (DISCOVER/OFFER/REQUEST/ACK)
- Multi-scope support with DHCP relay
- Static MAC-to-IP bindings
- Lease persistence (JSON) with auto-prune
- NACK for invalid requests
- Flask web management panel (dark theme, live refresh)
- Admin-privileged scapy sniff on UDP 67

.gitignore

@@ -0,0 +1,11 @@
+__pycache__/
+*.pyc
+*.db
+*.log
+*.yaml
+!*.yaml.example
+.env
+*.egg-info/
+dist/
+build/
+.ipynb_checkpoints/