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

.gitignore

@@ -0,0 +1,46 @@
+# Binaries
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+server
+dyn
+
+# Test binary
+*.test
+
+# Output of the go coverage tool
+*.out
+
+# Database
+dyn.db
+*.db
+*.db-journal
+*.db-shm
+*.db-wal
+
+# Data directory
+data/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Environment
+.env
+.env.local
+
+# Dependencies (keep go.sum)
+vendor/
+
+# Temporary files
+*.tmp
+*.temp