refactor: archive old features directory to features.old

The new profile-based structure (home/base, home/desktop, home/server,
home/profiles/, home/coding) is fully operational and imported via
home/lib/mkHomeConfig. The legacy home/features directory is no longer
referenced anywhere in the configuration.

Archived rather than deleted to preserve history for reference.

home/features.old/desktop/webapps.nix

@@ -0,0 +1,55 @@
+{
+  pkgs,
+  lib,
+  ...
+}: let
+  icons = {
+    teams = pkgs.fetchurl {
+      url = "https://cdn.jsdelivr.net/gh/homarr-labs/dashboard-icons/svg/microsoft-teams.svg";
+      sha256 = "sha256-Pr9QS8nnXJq97r4/G3c6JXi34zxHl0ps9gcyI8cN/s8=";
+    };
+    outlook = pkgs.fetchurl {
+      url = "https://cdn.jsdelivr.net/gh/homarr-labs/dashboard-icons/svg/microsoft-outlook.svg";
+      sha256 = "sha256-3u8t5QNHFZvrAegxBiGicO4PjtMWhEaQSCv7MSSfLLc=";
+    };
+    opencode = pkgs.fetchurl {
+      url = "https://cdn.jsdelivr.net/gh/homarr-labs/dashboard-icons/svg/opencode-dark.svg";
+      sha256 = "1lms4f8habamvdh2qqqz9psx4py9wx23mmlkkds44pvrbq3bkj3n";
+    };
+  };
+in {
+  xdg.desktopEntries = {
+    teams = {
+      name = "Microsoft Teams";
+      exec = "launch-webapp https://teams.microsoft.com";
+      comment = "Open Microsoft Teams as a Desktop App";
+      categories = ["Application" "Network" "Chat"];
+      terminal = false;
+      icon = icons.teams;
+    };
+    outlook = {
+      name = "Microsoft Outlook";
+      exec = "launch-webapp https://outlook.office.com/mail/";
+      comment = "Open Microsoft Outlook as a Desktop App";
+      categories = ["Application" "Network"];
+      terminal = false;
+      icon = icons.outlook;
+    };
+    basecamp = {
+      name = "Basecamp";
+      exec = "launch-webapp https://3.basecamp.com/5996442/";
+      comment = "Open Basecamp as a Desktop App";
+      categories = ["Application" "Network"];
+      terminal = false;
+      icon = "/home/sascha.koenig/.local/share/icons/basecamp-logo.png";
+    };
+    opencode = {
+      name = "Opencode";
+      exec = "rofi-project-opener";
+      comment = "Open Opencode Terminal App";
+      categories = ["Application" "Development"];
+      terminal = false;
+      icon = icons.opencode;
+    };
+  };
+}