Add opensc (PKCS#11) and pcsc-tools, enable pcscd, and add a udev rule
granting access to the built-in reader (2ce3:9563), which the shipped
CCID rules miss (pcscd hit LIBUSB_ERROR_ACCESS). Configure Firefox to
load the OpenSC PKCS#11 module for TLS client-cert auth and force-install
the Web eID extension.
Add nix-flatpak flake input and modules/gaming.nix managing Flatpak
remotes/packages declaratively: Bolt (Jagex launcher for RS3/OSRS) and
Sober (Roblox). Add Heroic and hyperplay-ext, plus Proton-GE for Steam.
Drops the old imperative runescape-launcher.
