Add new server modules and configurations for various services

- Introduced `default-creds` module for managing default credentials with Umami integration.
- Added `fail2ban` module for brute-force attack protection with configurable ban times.
- Created `firewall` module to enable and configure basic firewall settings.
- Implemented `gitea` module for self-hosted Git service with PostgreSQL backend.
- Developed `glance` module for a customizable dashboard with various widgets and themes.
- Added `iknowyou` module for a self-hosted password manager with production and demo environments.
- Introduced `kernel-hardening` module for enhancing kernel security settings.
- Created `mazanoke` module for a simple web application with Nginx integration.
- Added `mealie` module for a self-hosted meal planning application.
- Implemented `stirling-pdf` module for PDF generation service.
- Developed `umami` module for self-hosted analytics with secret management.
- Added `ssh` module for secure SSH configuration with user restrictions.
- Introduced `nixy` theme for a customized aesthetic experience across services.

docs/NEOVIM.md

@@ -0,0 +1,40 @@
+# Neovim
+
+The Neovim configuration is built with [nvf](https://github.com/notashelf/nvf) and exposed as a standalone flake output.
+It can be used in three ways: run it directly, import it into another flake's home-manager setup, or use it as part of this config.
+
+## Run directly
+
+No installation needed:
+
+```sh
+nix run github:anotherhadi/nixy#nvim
+```
+
+## Use in another flake
+
+Add this repo as an input:
+
+```nix
+inputs.nixy.url = "github:anotherhadi/nixy";
+```
+
+Then import the home-manager module in your home configuration:
+
+```nix
+{ inputs, ... }: {
+  imports = [ inputs.nixy.homeManagerModules.nvim ];
+}
+```
+
+## What's included
+
+| File            | Description                                                            |
+| --------------- | ---------------------------------------------------------------------- |
+| `options.nix`   | Core settings: theme (catppuccin mocha), clipboard, indentation, folds |
+| `languages.nix` | LSP, treesitter, formatters, diagnostics, and per-language config      |
+| `keymaps.nix`   | All key mappings (leader: `space`)                                     |
+| `picker.nix`    | Snacks picker + oil.nvim                                               |
+| `snacks.nix`    | Snacks extras: image preview, zen mode, git signs, statuscolumn        |
+| `utils.nix`     | Bufferline, lualine, copilot, lazygit, toggleterm, autocomplete        |
+| `mini.nix`      | Mini.nvim suite: pairs, comment, icons, indentscope, diff, git         |