Introduce CoreOutboundBuilder.kt to centralize ProfileItem → OutboundBean conversion logic. Provides createInitOutbound and per-protocol builders for VMESS, VLESS, Shadowsocks, SOCKS, Trojan, WireGuard, Hysteria2 and HTTP. Includes reusable helpers populateTransportSettings and populateTlsSettings to configure network transport, TLS/REALITY settings, finalmask manipulation and optional fragmentation via MMKV prefs. Also adds domain resolution logic (with IPv6 preference) in getServerAddress and preserves original format-specific behaviors.
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