Refactor alias management and improve bootstrap process for Zsh

dotfiles/.zshrc

@@ -76,8 +76,15 @@ eval "$(zoxide init zsh)"
 # For a full list of active aliases, run `alias`.
 
 # Load custom aliases
+# Define ZSH_CUSTOM if not already defined
+if [ -z "$ZSH_CUSTOM" ]; then
+    ZSH_CUSTOM="$HOME/.oh-my-zsh/custom"
+fi
+
 if [ -f "$ZSH_CUSTOM/aliases.zsh" ]; then
     source "$ZSH_CUSTOM/aliases.zsh"
+elif [ -f "$HOME/.oh-my-zsh/custom/aliases.zsh" ]; then
+    source "$HOME/.oh-my-zsh/custom/aliases.zsh"
 fi
 
 # set directory to home