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>

README.md

@@ -27,11 +27,13 @@ home-manager switch --flake github:Logan-Lin/nix-config#yanlin
 ```
 .
 ├── flake.nix          # Main flake configuration and package definitions
-├── nvim.nix           # Neovim configuration with plugins and keymaps
+├── tmux.sh            # Tmux session automation script
-├── tmux.nix           # Tmux setup with vim-like navigation
+├── modules/           # Nix configuration modules
-├── zsh.nix            # Zsh with Powerlevel10k and modern CLI tools
+│   ├── nvim.nix       # Neovim configuration with plugins and keymaps
-├── p10k.zsh           # Powerlevel10k theme configuration (managed by Nix)
+│   ├── tmux.nix       # Tmux setup with vim-like navigation
-└── tmux.sh            # Tmux session automation script
+│   └── zsh.nix        # Zsh with Powerlevel10k and modern CLI tools
+└── config/            # Configuration files
+    └── p10k.zsh       # Powerlevel10k theme configuration
 ```
 
 ## 🛠️ Software Configurations

flake.nix

@@ -30,9 +30,9 @@
     homeConfiguration = { pkgs, ... }: {
       imports = [ 
         nixvim.homeManagerModules.nixvim
-        ./nvim.nix 
+        ./modules/nvim.nix 
-        ./tmux.nix 
+        ./modules/tmux.nix 
-        ./zsh.nix 
+        ./modules/zsh.nix 
       ];
 
       home.username = "yanlin";

modules/zsh.nix

@@ -94,5 +94,5 @@
   };
   
   # Manage Powerlevel10k configuration
-  home.file.".p10k.zsh".source = ./p10k.zsh;
+  home.file.".p10k.zsh".source = ../config/p10k.zsh;
 }