Add full integration test with real Technitium DNS server

- Add docker-compose.integration.yml with Technitium + DDNS services
- Add full-integration-test.sh for end-to-end testing
- Add technitium-init.sh for automated zone/token setup
- Add comprehensive logging to DNS client
- Test creates real DNS records and verifies them in Technitium
- 8/9 tests passing with real DNS integration

tests/integration/technitium-init.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+# Wait for Technitium to be ready
+echo "Waiting for Technitium DNS to start..."
+while ! wget -q --spider http://localhost:5380/ 2>/dev/null; do
+    sleep 2
+done
+
+echo "Technitium is up, configuring..."
+
+# Login and get session
+curl -s -X POST http://localhost:5380/api/login \
+    -H "Content-Type: application/json" \
+    -d '{"username":"admin","password":"admin123"}' > /tmp/login.json
+
+if [ ! -f /tmp/login.json ]; then
+    echo "Failed to login to Technitium"
+    exit 1
+fi
+
+# Create the zone 'space.test.rip'
+echo "Creating zone space.test.rip..."
+curl -s -X POST http://localhost:5380/api/zones/create \
+    -H "Content-Type: application/json" \
+    -d '{
+        "zone": "space.test.rip",
+        "type": "Primary"
+    }'
+
+echo ""
+
+# Create API token for DDNS service
+echo "Creating API token..."
+curl -s -X POST http://localhost:5380/api/user/createApiToken \
+    -H "Content-Type: application/json" \
+    -d '{
+        "username": "admin",
+        "tokenName": "ddns-bridge",
+        "token": "dns-api-token-12345"
+    }'
+
+echo ""
+echo "Technitium initialization complete!"