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2121b56511
Implement initial DTLS handshake flow for server and client using pion/dtls. Load server and client configuration from .env/environment, including new debug flags and logging config. On the server: - load ServerConfig from env, including DTLS listen addr and debug flag - create DTLS listener with optional self-signed localhost cert in debug - accept DTLS sessions and run PerformServerHandshake with a dummy domain validator On the client: - load ClientConfig from env, then override with CLI flags where given - validate required fields: server_addr, domain, api_key, local_target - create DTLS client and run PerformClientHandshake - support debug mode to skip server certificate verification Also: - update go.mod/go.sum with pion/dtls and related dependencies - extend .env.example with new ports, client config, and debug flags - ignore built binaries via bin/ in .gitignore BREAKING CHANGE: client environment variables have changed. The former HOP_CLIENT_ID, HOP_CLIENT_AUTH_TOKEN and HOP_CLIENT_SERVICE_PORTS are replaced by HOP_CLIENT_DOMAIN, HOP_CLIENT_API_KEY, HOP_CLIENT_LOCAL_TARGET and HOP_CLIENT_DEBUG. Client startup now requires server_addr, domain, api_key and local_target to be provided (via env or CLI).