i18n(ru): translate new strings for Mux, request headers and updates (#10160)

Add the 10 Russian strings missing from ResUI.ru.resx: the
update-via-proxy toggle in Check Update, the WireGuard DNS label, the
Xray Mux settings row and its concurrency, XUDP concurrency and
UDP/443 (QUIC) handling fields, the subscription HTTP headers label,
tip and validation message, and the Process column in Connections.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>