Launcher: remove screen-blanking, trim settings menu, fix WiFi/app visibility

[eggfly]

Summary

• #92: Remove all DarkTime screen-blanking logic (delete ui_darkscreen.*, drop the ui_darkscreen_filter_key keyboard hook + ui_darkscreen_tick call, remove the DarkTime settings entry). Idle blanking isn't needed on this device and backlight control was ineffective.
• #93: Remove the "Run Setup Wizard" and "Factory Reset" settings entries.
• feat(OOBE): drop stale prebuilt wizard binary, add settings re-run path #66: Strip the imager/netplan netplan-<iface>- prefix from displayed Wi-Fi SSIDs so the UI shows the plain network name.
• feat(status-bar): 顶栏以太网状态图标（WiFi 绿，自动切换） #59: Stop hidden built-in apps from reappearing in the launcher — never let a third-party .desktop shadow a built-in, and locate the Launcher settings menu by label instead of a fixed index when toggling visibility.

Test plan

• Cross-compiled APPLaunch (arm64 docker) and deployed to device 192.168.50.150; launcher boots and runs.
• Toggle a built-in app (e.g. Math) off in Launcher settings; confirm the icon disappears after returning to the launcher.
• On an imager/netplan-provisioned network, confirm the WiFi name shows without the netplan-wlan0- prefix.
• Confirm Settings no longer shows DarkTime / Run Setup Wizard / Factory Reset.

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