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>

modules/tmux.nix

@@ -0,0 +1,99 @@
+{ pkgs, ... }:
+
+{
+  programs.tmux = {
+    enable = true;
+    shortcut = "a";
+    baseIndex = 1;   # Start windows and panes at 1, not 0
+    mouse = true;    # Enable mouse support
+    keyMode = "vi";  # Use vi key bindings in copy mode
+    terminal = "screen-256color";  # Force 256 color support
+    
+    extraConfig = ''
+      # Terminal settings
+      set -g default-terminal "screen-256color"
+      set -ga terminal-overrides ",xterm-256color:Tc"
+      
+      # Gruvbox Dark Theme (Truecolor)
+      # Status bar colors
+      set -g status-style 'bg=#282828,fg=#ebdbb2'
+      set -g status-left-style 'bg=#a89984,fg=#282828'
+      set -g status-right-style 'bg=#a89984,fg=#282828'
+      
+      # Window status colors
+      set -g window-status-style 'bg=#3c3836,fg=#a89984'
+      set -g window-status-current-style 'bg=#fabd2f,fg=#282828'
+      set -g window-status-activity-style 'bg=#fb4934,fg=#282828'
+      
+      # Pane border colors
+      set -g pane-border-style 'fg=#3c3836'
+      set -g pane-active-border-style 'fg=#fabd2f'
+      
+      # Message colors
+      set -g message-style 'bg=#fabd2f,fg=#282828'
+      set -g message-command-style 'bg=#fabd2f,fg=#282828'
+      
+      # Status bar content
+      set -g status-left-length 40
+      set -g status-right-length 20
+      set -g status-left ' #S '
+      set -g status-right '#{?client_prefix,#[reverse]<Prefix>#[noreverse] ,}'
+      
+      # Window status format
+      set -g window-status-format ' #I:#W '
+      set -g window-status-current-format ' #I:#W '
+      
+      # Better key bindings for splitting panes
+      bind | split-window -h -c "#{pane_current_path}"
+      bind - split-window -v -c "#{pane_current_path}"
+      unbind '"'
+      unbind %
+      
+      # Vim-like pane navigation
+      bind h select-pane -L
+      bind j select-pane -D
+      bind k select-pane -U
+      bind l select-pane -R
+      
+      # Vim-like pane resizing
+      bind -r H resize-pane -L 5
+      bind -r J resize-pane -D 5
+      bind -r K resize-pane -U 5
+      bind -r L resize-pane -R 5
+      
+      # Quick pane cycling
+      unbind o
+      bind ^A select-pane -t :.+
+      
+      # Reload config file
+      bind r source-file ~/.config/tmux/tmux.conf \; display-message "Config reloaded!"
+      
+      # Better copy mode
+      bind-key -T copy-mode-vi v send-keys -X begin-selection
+      bind-key -T copy-mode-vi y send-keys -X copy-pipe-and-cancel "pbcopy"
+      bind-key -T copy-mode-vi r send-keys -X rectangle-toggle
+      
+      # New window with current path
+      bind c new-window -c "#{pane_current_path}"
+      
+      # Don't rename windows automatically
+      set-option -g allow-rename off
+      
+      # Increase scrollback buffer size
+      set -g history-limit 10000
+      
+      # Display messages for longer
+      set -g display-time 2000
+      
+      # Faster command sequences
+      set -s escape-time 0
+      
+      # Activity monitoring
+      setw -g monitor-activity on
+      set -g visual-activity off
+      
+      # Automatically renumber windows
+      set -g renumber-windows on
+    '';
+  };
+}