refactor: standardize config structure and consolidate modules

- Standardized apps/ directory by renaming all entry points (e.g., home.nix) to default.nix and updating imports to use directory paths.
- Consolidated system/ logic into modules/system/, eliminating the top-level system/ directory and redundant wrappers.
- Merged subsidiary utility scripts (e.g., hakase-popup.nix, switch-wallpaper.nix) into their parent default.nix files for better cohesion.
- Cleaned up unused files and updated all module references to reflect the new structure.

apps/hyprland/default.nix

@@ -1,38 +1,15 @@
 {
-  myConfig,
-  inputs,
-  pkgs,
-  ...
-}: {
-  programs.hyprland = {
-    enable = true;
-    package = inputs.hyprland.packages.${pkgs.stdenv.hostPlatform.system}.hyprland;
-    portalPackage = inputs.hyprland.packages.${pkgs.stdenv.hostPlatform.system}.xdg-desktop-portal-hyprland;
-    withUWSM = true;
-  };
+  imports = [
+    ./hypr/binds.nix
+    ./hypr/general.nix
+    ./hypr/exec.nix
+    ./hypr/rules.nix
+    ./hypr/animation.nix
+    ./hypr/misc.nix
+    ./hypr/input.nix
 
-  environment.systemPackages = [
-    pkgs.hyprpicker
-    pkgs.hyprlock
-    pkgs.hypridle
-    pkgs.hyprpaper
-    pkgs.hyprsunset
-    pkgs.hyprpolkitagent
+    ./scripts/movement.nix
   ];
-
-  xdg.terminal-exec = {
-    enable = true;
-    settings = {
-      default = ["${myConfig.terminal.default}"];
-    };
-  };
-
-  # systemd.user.services.hyprpolkitagent = {
-  #   description = "Hyprland Polkit Agent";
-  #   wantedBy = ["graphical-session.target"];
-  #   serviceConfig = {
-  #     ExecStart = "${pkgs.hyprpolkitagent}/libexec/hyprpolkitagent";
-  #     Restart = "on-failure";
-  #   };
-  # };
+  wayland.windowManager.hyprland.enable = true;
+  wayland.windowManager.hyprland.systemd.enable = false; # for UWSM support...
 }

apps/hyprland/home.nix

@@ -1,15 +0,0 @@
-{
-  imports = [
-    ./hypr/binds.nix
-    ./hypr/general.nix
-    ./hypr/exec.nix
-    ./hypr/rules.nix
-    ./hypr/animation.nix
-    ./hypr/misc.nix
-    ./hypr/input.nix
-
-    ./scripts/movement.nix
-  ];
-  wayland.windowManager.hyprland.enable = true;
-  wayland.windowManager.hyprland.systemd.enable = false; # for UWSM support...
-}

apps/hyprland/scripts/terminal.nix

@@ -1,9 +0,0 @@
-{pkgs, ...}: let
-  hakase-terminal-launch =
-    pkgs.writeShellScriptBin "hakase-terminal-launch" ''
-    '';
-in {
-  home.packages = [
-    hakase-terminal-launch
-  ];
-}