Add two new ucode scripts: import_link.uc (a headless importer for proxy share-links) and node_parse.uc (a shared parse_uri implementation). import_link.uc reads a link or a file of links, uses the shared parse_uri to convert each share-link into a homeproxy UCI node section, names sections with a stable FNV-1a hash, commits imported nodes (no grouphash) and emits JSON results. node_parse.uc implements comprehensive parsing for many URI schemes (vless, vmess, trojan, ss, hysteria, tuic, ssh, wireguard, naive, http(s), socks, etc.), performs validation, and surfaces sing-box feature checks for QUIC/UTLS support. This centralizes link parsing to avoid duplicate implementations and keeps the subscription importer and CLI/agent import in sync.
