feat: redesign the project structure

modules/nixos/core-server.nix

@@ -0,0 +1,96 @@
+{ config, pkgs, devenv, ... }:
+
+{
+  # enable flakes globally
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # Set your time zone.
+  time.timeZone = "Asia/Shanghai";
+
+  # Select internationalisation properties.
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  i18n.extraLocaleSettings = {
+    LC_ADDRESS = "zh_CN.UTF-8";
+    LC_IDENTIFICATION = "zh_CN.UTF-8";
+    LC_MEASUREMENT = "zh_CN.UTF-8";
+    LC_MONETARY = "zh_CN.UTF-8";
+    LC_NAME = "zh_CN.UTF-8";
+    LC_NUMERIC = "zh_CN.UTF-8";
+    LC_PAPER = "zh_CN.UTF-8";
+    LC_TELEPHONE = "zh_CN.UTF-8";
+    LC_TIME = "zh_CN.UTF-8";
+  };
+
+  # all fonts are linked to /nix/var/nix/profiles/system/sw/share/X11/fonts
+  fonts = {
+    # use fonts specified by user rather than default ones
+    enableDefaultFonts = false;
+    fontDir.enable = true;
+
+    fonts = with pkgs; [
+      # icon fonts
+      material-design-icons
+      font-awesome
+
+      # 思源系列字体是 Adobe 主导的。其中汉字部分被称为「思源黑体」和「思源宋体」，是由 Adobe + Google 共同开发的
+      source-sans       # 无衬线字体，不含汉字。字族名叫 Source Sans 3 和 Source Sans Pro，以及带字重的变体，加上 Source Sans 3 VF
+      source-han-sans   # 思源黑体
+
+      # nerdfonts
+      (nerdfonts.override { fonts = [
+        "FiraCode"
+        "JetBrainsMono"
+        "Iosevka"
+      ];})
+    ];
+
+    # user defined fonts
+    # the reason there's Noto Color Emoji everywhere is to override DejaVu's
+    # B&W emojis that would sometimes show instead of some Color emojis
+    fontconfig.defaultFonts = {
+      sansSerif = [ "Noto Sans" "Noto Color Emoji" ];
+      monospace = [ "JetBrainsMono Nerd Font" "Noto Color Emoji" ];
+      emoji = [ "Noto Color Emoji" ];
+    };
+  };
+
+  # networking.firewall.allowedTCPPorts = [ ... ];
+  # networking.firewall.allowedUDPPorts = [ ... ];
+  # Or disable the firewall altogether.
+  networking.firewall.enable = false;
+
+  # Enable the OpenSSH daemon.
+  services.openssh = {
+    enable = true;
+    settings = {
+      X11Forwarding = true;
+      PermitRootLogin = "no";         # disable root login
+      PasswordAuthentication = false; # disable password login
+    };
+    openFirewall = true;
+  };
+
+  # Allow unfree packages
+  nixpkgs.config.allowUnfree = true;
+
+  # List packages installed in system profile. To search, run:
+  # $ nix search wget
+  environment.systemPackages = with pkgs; [
+    neovim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
+    wget
+    curl
+    aria2
+    git      # used by nix flakes
+    git-lfs  # used by huggingface models
+  ];
+
+  # replace default editor with neovim
+  environment.variables.EDITOR = "nvim";
+
+  # for power management
+  services.power-profiles-daemon = {
+    enable = true;
+  };
+  services.upower.enable = true;
+}