feat: implement modular foundation and core system services

- Update flake.nix with 25.11 release and core inputs
- Add dedicated modules for audio (Pipewire), bluetooth, and networking
- Update GEMINI.md with the new Modular Merging Architecture blueprint
- Configure graphical installer ISO and test VM outputs

bin/nomarchy-install-dev-env-nixos-wrapper

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+# Install one of the supported development environments declaratively for Nomarchy NixOS.
+
+if [[ -z $1 ]]; then
+  echo "Usage: nomarchy-install-dev-env <ruby|node|bun|deno|go|laravel|symfony|php|python|elixir|phoenix|rust|java|zig|ocaml|dotnet|clojure|scala>" >&2
+  exit 1
+fi
+
+case "$1" in
+php)
+  echo -e "Installing PHP and extensions declaratively...\n"
+  # This uses the already refactored declarative nomarchy-pkg-add
+  nomarchy-pkg-add php
+  nomarchy-pkg-add phpExtensions.bcmath
+  nomarchy-pkg-add phpExtensions.intl
+  nomarchy-pkg-add phpExtensions.iconv
+  nomarchy-pkg-add phpExtensions.openssl
+  nomarchy-pkg-add phpExtensions.pdo_sqlite
+  nomarchy-pkg-add phpExtensions.pdo_mysql
+  nomarchy-pkg-add phpPackages.composer
+  echo -e "\nPHP environment added to your packages."
+  ;;
+# The rest use 'mise' which is already installed and manages its own state in ~/.config/mise
+*)
+  # Delegate to the original script logic if mise is used
+  # Or we can just call the mise command directly if it's a simple case.
+  # Let's keep the mise-based language installs as they are, but make sure mise is available.
+  /etc/profiles/per-user/$USER/bin/nomarchy-install-dev-env.original "$@"
+  ;;
+esac