Unbitch flake.nix - extract shell scripts to separate files

- Moved all inline shell scripts to packages/scripts/
- Created packages/default.nix for clean package definitions
- Reduced flake.nix from 400+ lines to ~80 lines
- Maintained all functionality while improving maintainability
- All builds and checks still pass

packages/default.nix

@@ -0,0 +1,19 @@
+# Package definitions for dots-hyprland utilities
+{ pkgs }:
+
+let
+  scriptsPath = ./scripts;
+in
+{
+  update-flake = pkgs.writeShellScriptBin "update-flake" 
+    (builtins.readFile "${scriptsPath}/update-flake.sh");
+  
+  test-python-env = pkgs.writeShellScriptBin "test-python-env" 
+    (builtins.readFile "${scriptsPath}/test-python-env.sh");
+  
+  test-quickshell = pkgs.writeShellScriptBin "test-quickshell" 
+    (builtins.readFile "${scriptsPath}/test-quickshell.sh");
+  
+  compare-modes = pkgs.writeShellScriptBin "compare-modes" 
+    (builtins.readFile "${scriptsPath}/compare-modes.sh");
+}