S-UI-X Extended v1.0.6-beta1

Adds sudoku and mieru share links, makes the sudoku http-mask mode visible in the inbound editor, and ships a console menu for the AmneziaWG device key-encryption key.

• Sudoku and mieru now produce a share link and QR. Sudoku emits sudoku:// (base64url of the short-link JSON, matching SUDOKU-ASCII/sudoku); mieru emits mierus:// (the enfein/mieru simple URL). Both stay JSON-delivered, so the subscription path is unchanged and the link is an addition.
• Sudoku http-mask mode is now easy to find: the inbound fields sit in a titled card, the selector has a placeholder and a hint (empty means the core default, legacy), and the recommended preset fills it in. A regression test locks legacy/stream/poll/auto/ws into the client config.
• The raw-links tab no longer reads like a failure for JSON-delivered protocols; it explains that they are delivered through the subscription and points to the Sing-box tab.
• Web-panel self-update replaces the binary and restarts the service but does not run install.sh, so it never provisions AWG_KEY_ENC. A panel updated only through the web UI could still fail managed AmneziaWG device operations with awg: AWG encryption key is unavailable.
• Menu item 23 in s-ui is now "Generate env keys" with a submenu: session cookie key (SUI_COOKIE_KEY) and AmneziaWG device key (AWG_KEY_ENC). The AWG option generates the key when it is missing from /etc/s-ui/secretbox.env, wires up the systemd drop-in, and offers a restart. An existing key is kept unless a rotation is confirmed.
• Fixed write_env_value in the console script duplicating a line instead of replacing the value when an env key already existed (an exit 0 inside the awk detector was overwritten by the trailing END { exit 1 }). This also affected rotating SUI_COOKIE_KEY from the menu.
• Added scripts/setup-awg-key.sh for the same check-and-generate as a standalone command.

This is a prerelease. A prerelease suffix sorts below the final release, so publish or install it explicitly from the tag.

Full release notes: docs/releases/v1.0.6-beta1.md.