Initial commit: DDNS service with NIC V2 protocol support

Features:
- Token-based subdomain claiming
- NIC V2 (DynDNS2) protocol implementation
- Technitium DNS integration
- Rate limiting (10 req/min IP, 1 req/min token)
- Web UI for space claiming
- Docker/Docker Compose support
- Compatible with UniFi, pfSense, EdgeRouter

Module: git.dws.rip/DWS/dyn

docker-compose.yml

@@ -0,0 +1,29 @@
+version: '3.8'
+
+services:
+  dyn:
+    build: .
+    container_name: dyn-ddns
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+    volumes:
+      - ./data:/data
+    environment:
+      - SERVER_PORT=8080
+      - DATABASE_PATH=/data/dyn.db
+      - TECHNITIUM_URL=${TECHNITIUM_URL}
+      - TECHNITIUM_TOKEN=${TECHNITIUM_TOKEN}
+      - TECHNITIUM_USERNAME=${TECHNITIUM_USERNAME:-}
+      - TECHNITIUM_PASSWORD=${TECHNITIUM_PASSWORD:-}
+      - BASE_DOMAIN=${BASE_DOMAIN:-dws.rip}
+      - SPACE_SUBDOMAIN=${SPACE_SUBDOMAIN:-space}
+      - RATE_LIMIT_PER_IP=${RATE_LIMIT_PER_IP:-10}
+      - RATE_LIMIT_PER_TOKEN=${RATE_LIMIT_PER_TOKEN:-1}
+      - TRUSTED_PROXIES=${TRUSTED_PROXIES:-}
+    healthcheck:
+      test: ["CMD", "wget", "-q", "--spider", "http://localhost:8080/"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 5s