feat: upgrade to NixOS 25.11

- Update nixpkgs and home-manager to 25.11 release
- Update flake dependencies
- Migrate git config to settings attribute
- Replace deprecated packages (mpc-cli -> mpc, vaapiIntel -> intel-vaapi-driver)
- Fix system references to use stdenv.hostPlatform.system
- Add crowdsec module overrides
- Remove android-udev-rules from fuchsia
- Configure SSH with enableDefaultConfig = false
- Update zsh dotDir to use config.xdg.configHome

home-manager/sajenim/features/editors/default.nix

@@ -27,10 +27,10 @@
     ]
     ++ [
       # Our personal neovim configuration.
-      inputs.nixvim.packages.${pkgs.system}.default
+      inputs.nixvim.packages.${pkgs.stdenv.hostPlatform.system}.default
     ]
     # Install jetbrains IDEs with plugins
-    ++ (with inputs.nix-jetbrains-plugins.lib."${system}"; [
+    ++ (with inputs.nix-jetbrains-plugins.lib."${pkgs.stdenv.hostPlatform.system}"; [
       (buildIdeWithPlugins pkgs.jetbrains "idea-ultimate" [
         "IdeaVIM"
         "gruvbox-material-dark"