Summary

• Raise minimum libmicrohttpd requirement to 1.0.0 and migrate all deprecated APIs to their v3 replacements (Basic Auth v3, Digest Auth v3 with SHA-512/256, userhash, nonce binding, and structured digest_auth_result enum)
• Add new response types: empty_response, pipe_response, iovec_response
• Add external event loop integration: run(), run_wait(), get_fdset(), get_timeout(), add_connection()
• Add daemon management: quiesce(), get_listen_fd(), get_active_connections(), get_bound_port()
• Add daemon options: listen_backlog, address_reuse, connection_memory_increment, tcp_fastopen_queue_size, sigpipe_handled_by_app, https_mem_dhparams, https_key_password, https_priorities_append, no_alpn, client_discipline_level
• Add startup flags: no_listen_socket, no_thread_safety, turbo, suppress_date_header
• Add conditional WebSocket support via libmicrohttpd_ws (websocket_handler, websocket_session, register_ws_resource())
• Add utility functions: reason_phrase(), is_feature_supported(), get_mhd_version()

Breaking changes

• Minimum libmicrohttpd bumped from 0.9.64 to 1.0.0
• check_digest_auth() now returns digest_auth_result enum instead of bool + reload_nonce out-param
• check_digest_auth_ha1() renamed to check_digest_auth_digest() to match MHD v3 naming
• Default digest algorithm changed from MD5 to SHA-256
• digest_auth_fail_response constructor parameter order changed; reload_nonce renamed to signal_stale

Test plan

• Existing authentication tests updated for v3 API
• New daemon_info integration test for daemon management methods
• New new_response_types integration test for empty/pipe/iovec responses
• Run make check with libmicrohttpd >= 1.0.0
• Verify WebSocket conditional compilation (with and without libmicrohttpd_ws)