Fix DHCP client unable to get IP and config not persisting

- Fixed verifyAssignment being too strict for new clients
- Fixed parseRequestedIP string conversion bug
- Fixed response sent to 0.0.0.0 instead of broadcast address
- Added SO_BROADCAST support for UDP socket
- Fixed session persistence after page refresh (localStorage)
- Added in-memory session store for auth middleware
- Added config reloader so DHCP server picks up web UI changes dynamically

docker-compose.yml

@@ -0,0 +1,17 @@
+version: '3.8'
+
+services:
+  dhcp-dns-manager:
+    build: .
+    ports:
+      - "53:53/udp"
+      - "67:67/udp"
+      - "8080:8080/tcp"
+    volumes:
+      - ./data:/root/data
+      - ./configs:/root/configs
+    restart: unless-stopped
+    network_mode: host
+    cap_add:
+      - NET_ADMIN
+      - NET_RAW