Reorganize configuration into modular directory structure

- Create modules/ directory for Nix configuration modules
- Create config/ directory for configuration files
- Move nvim.nix, tmux.nix, zsh.nix to modules/
- Move p10k.zsh to config/
- Update flake.nix import paths to reference new structure
- Update zsh.nix p10k.zsh path reference
- Update README.md architecture documentation
- Keep tmux.sh at root for easy accessibility

This provides better separation between Nix modules and config files
while maintaining a clean, scalable structure.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

zsh.nix

@@ -1,98 +0,0 @@
-{ pkgs, ... }:
-
-{
-  programs.zsh = {
-    enable = true;
-    defaultKeymap = "viins";
-    enableVteIntegration = true;
-    enableCompletion = true;
-    autosuggestion.enable = true;
-    syntaxHighlighting.enable = true;
-    
-    sessionVariables = {
-      COLORTERM = "truecolor";
-      EDITOR = "nvim";
-    };
-    
-    shellAliases = {
-      ll = "ls -alF";
-      la = "ls -A";
-      l = "ls -CF";
-      ".." = "cd ..";
-      "..." = "cd ../..";
-      
-      # Git aliases
-      gs = "git status";
-      ga = "git add";
-      gc = "git commit";
-      gp = "git push";
-      gl = "git pull";
-      gd = "git diff";
-      
-      # Nix helpers
-      hm = "home-manager";
-      hms = "home-manager switch --flake ~/.config/nix#yanlin";
-    };
-    
-    initContent = ''
-      # Load Powerlevel10k theme
-      if [[ -f ${pkgs.zsh-powerlevel10k}/share/zsh-powerlevel10k/powerlevel10k.zsh-theme ]]; then
-        source ${pkgs.zsh-powerlevel10k}/share/zsh-powerlevel10k/powerlevel10k.zsh-theme
-      fi
-      
-      # Load Powerlevel10k configuration (managed by Nix)
-      source ~/.p10k.zsh
-      
-      # Vim mode configuration
-      # Reduce delay when switching modes (10ms instead of 400ms)
-      export KEYTIMEOUT=1
-      
-      # Cursor shape changes for vim modes
-      function zle-keymap-select {
-        case $KEYMAP in
-          vicmd)      echo -ne '\e[1 q';;  # block cursor for normal mode
-          viins|main) echo -ne '\e[5 q';;  # line cursor for insert mode
-        esac
-      }
-      zle -N zle-keymap-select
-      
-      # Ensure we start with line cursor in insert mode
-      function zle-line-init {
-        echo -ne '\e[5 q'
-      }
-      zle -N zle-line-init
-      
-      # Fix cursor after each command
-      function preexec {
-        echo -ne '\e[5 q'
-      }
-      
-      # Additional vim-like bindings
-      bindkey -M vicmd 'k' history-search-backward
-      bindkey -M vicmd 'j' history-search-forward
-      bindkey -M vicmd '/' history-incremental-search-backward
-      bindkey -M vicmd '?' history-incremental-search-forward
-      
-      # Better word movement in insert mode
-      bindkey '^[[1;5C' forward-word      # Ctrl+Right
-      bindkey '^[[1;5D' backward-word     # Ctrl+Left
-    '';
-  };
-  
-  # Essential packages for enhanced zsh experience
-  home.packages = with pkgs; [
-    zsh-powerlevel10k
-    fzf
-    fd
-    ripgrep
-    bat
-  ];
-  
-  programs.fzf = {
-    enable = true;
-    enableZshIntegration = true;
-  };
-  
-  # Manage Powerlevel10k configuration
-  home.file.".p10k.zsh".source = ./p10k.zsh;
-}