Refactored installer into modular library structure with improved error handling and logging.

The changes include:
- Split monolithic script into lib/, config/, profiles/, and files/ directories
- Added error handling with cleanup on failure
- Added installation logging to /var/log/arch-install.log
- Added username validation

profiles/packages.sh

@@ -0,0 +1,73 @@
+#!/bin/bash
+
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# packages.sh - Shared package group definitions
+#
+# Defines reusable package arrays used by installation profiles.
+
+# Media packages (browser, video player)
+PACKAGES_MEDIA=(
+    chromium
+    vlc
+    vlc-plugin-ffmpeg
+)
+
+# Office productivity packages
+PACKAGES_OFFICE=(
+    hunspell-en_us
+    libreoffice-fresh
+    keepassxc
+    qalculate-gtk
+)
+
+# General productivity packages
+PACKAGES_PRODUCTIVITY=(
+    ffmpeg
+    gimp
+    syncthing
+    tenacity
+)
+
+# Development base packages
+PACKAGES_DEV_BASE=(
+    git
+    docker
+    docker-compose
+)
+
+# Python development packages
+PACKAGES_DEV_PYTHON=(
+    python
+    python-virtualenv
+    pycharm-community-edition
+)
+
+# Java development packages
+PACKAGES_DEV_JAVA=(
+    jdk-openjdk
+    intellij-idea-community-edition
+)
+
+# Go development packages
+PACKAGES_DEV_GO=(
+    go
+)
+
+# Additional development tools
+PACKAGES_DEV_TOOLS=(
+    code
+    wireshark-qt
+)