refactor: modularize post-install setup script

Break down monolithic script into focused components:
- 00-system-prep.sh: system updates and Flathub
- 01-package-install.sh: system packages and Flatpaks
- 02-dev-tools-setup.sh: Neovim, fonts, shell tools
- 03-fedora-dotnet-setup.sh: .NET development environment
- 04-config-symlinks.sh: dotfile symlinking

Fixes:
- Use rpm -q for accurate package checks
- Dynamic Fedora version detection
- Replace neofetch with fastfetch
- Correct dotfile names (aliases.zsh, commit-conventions.txt)

main-setup.sh

@@ -0,0 +1,110 @@
+#!/bin/bash
+
+# Main setup script
+# Calls other scripts to perform post-installation tasks.
+
+# --- Global Variables & Helper Functions ---
+# SCRIPT_ROOT_DIR will be the directory where main-setup.sh is located
+export SCRIPT_ROOT_DIR
+SCRIPT_ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd)"
+export SCRIPTS_DIR="${SCRIPT_ROOT_DIR}/scripts"
+
+# Function to detect the Linux distribution
+detect_linux_distro() {
+    if [ -f /etc/os-release ]; then
+        # shellcheck disable=SC1091
+        . /etc/os-release
+        echo "$ID"
+    elif [ -f /etc/lsb-release ]; then
+        # shellcheck disable=SC1091
+        . /etc/lsb-release
+        echo "$DISTRIBUTOR_ID"
+    elif [ -f /etc/debian_version ]; then
+        echo "debian"
+    elif [ -f /etc/redhat-release ]; then
+        if grep -qi "fedora" /etc/redhat-release; then
+            echo "fedora"
+        elif grep -qi "centos" /etc/redhat-release; then
+            echo "centos"
+        elif grep -qi "red hat enterprise linux" /etc/redhat-release; then
+            echo "rhel"
+        else
+            echo "redhat"
+        fi
+    else
+        echo "unknown"
+    fi
+}
+
+# Detect the Linux distribution and set package manager
+export DISTRO
+DISTRO=$(detect_linux_distro)
+
+export PACKAGE_MANAGER
+case "$DISTRO" in
+    fedora|rhel|centos)
+        PACKAGE_MANAGER="dnf"
+        ;;
+    debian|ubuntu|pop)
+        PACKAGE_MANAGER="apt"
+        ;;
+    *)
+        echo "Unsupported distribution: $DISTRO"
+        exit 1
+        ;;
+esac
+
+echo "Detected Distribution: $DISTRO"
+echo "Using Package Manager: $PACKAGE_MANAGER"
+echo "Script Root Directory: $SCRIPT_ROOT_DIR"
+echo "--------------------------------------------------"
+
+# --- Execute Setup Scripts ---
+
+echo "Executing 00-system-prep.sh..."
+if ! bash "${SCRIPTS_DIR}/00-system-prep.sh"; then
+    echo "ERROR: 00-system-prep.sh failed."
+    exit 1
+fi
+echo "--------------------------------------------------"
+
+echo "Executing 01-package-install.sh..."
+if ! bash "${SCRIPTS_DIR}/01-package-install.sh"; then
+    echo "ERROR: 01-package-install.sh failed."
+    exit 1
+fi
+echo "--------------------------------------------------"
+
+echo "Executing 02-dev-tools-setup.sh..."
+if ! bash "${SCRIPTS_DIR}/02-dev-tools-setup.sh"; then
+    echo "ERROR: 02-dev-tools-setup.sh failed."
+    exit 1
+fi
+echo "--------------------------------------------------"
+
+if [ "$DISTRO" == "fedora" ]; then
+    echo "Executing 03-fedora-dotnet-setup.sh..."
+    if ! bash "${SCRIPTS_DIR}/03-fedora-dotnet-setup.sh"; then
+        echo "ERROR: 03-fedora-dotnet-setup.sh failed."
+        # Decide if this is a fatal error for the whole script
+        # exit 1
+    fi
+    echo "--------------------------------------------------"
+fi
+
+echo "Executing 04-config-symlinks.sh..."
+if ! bash "${SCRIPTS_DIR}/04-config-symlinks.sh"; then
+    echo "ERROR: 04-config-symlinks.sh failed."
+    # exit 1
+fi
+echo "--------------------------------------------------"
+
+echo ""
+echo "#####################################"
+echo # Main setup script finished!         #
+echo #####################################"
+echo "Please review the output for any manual steps or errors."
+echo "You may need to restart your terminal or log out/log in for all changes to take effect."
+
+exit 0
+