refactor: implement component-based architecture for enhanced maintainability

- Reorganize directory structure into core/, features/, and themes/
- Colocate application Nix logic, configs, scripts, and theme overrides
- Implement 'Inversion of Control' for theming: apps now pull theme-specific layouts
- Update flake.nix and shared library paths to match the new structure
- Document the new Feature-Centric architecture in README.md

features/apps/scripts/nomarchy-webapp-handler-zoom

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+url="$1"
+web_url="https://app.zoom.us/wc/home"
+
+if [[ $url =~ ^zoom(mtg|us):// ]]; then
+  confno=$(echo "$url" | sed -n 's/.*[?&]confno=\([^&]*\).*/\1/p')
+
+  if [[ -n $confno ]]; then
+    pwd=$(echo "$url" | sed -n 's/.*[?&]pwd=\([^&]*\).*/\1/p')
+
+    if [[ -n $pwd ]]; then
+      web_url="https://app.zoom.us/wc/join/$confno?pwd=$pwd"
+    else
+      web_url="https://app.zoom.us/wc/join/$confno"
+    fi
+  fi
+fi
+
+exec nomarchy-launch-webapp "$web_url"