Make flake self-contained - consolidate installer-replication

BREAKING CHANGE: Remove external dots-hyprland dependency

- Imported all essential configs from dots-hyprland/installer-replication
- Added complete configs/ directory with:
  - hypr/ - Hyprland configuration
  - quickshell/ - Quickshell widgets and config
  - applications/ - Application configurations
  - scripts/ - Utility scripts
  - matugen/ - Material You theming
- Updated flake.nix to use local ./configs instead of external repo
- Simplified update-flake script (removed external repo management)
- Updated README to reflect self-contained architecture
- All builds pass with local configurations

Benefits:
- No external repository dependencies
- Faster builds (no network dependencies)
- Version controlled configs in single repo
- Easier maintenance and development
- Complete installer replication in one place

packages/scripts/dev-shell-hook.sh

@@ -1,22 +1,27 @@
 #!/usr/bin/env bash
-echo "🚀 dots-hyprland installer replication development environment"
+echo "🚀 dots-hyprland self-contained installer replication"
 echo ""
 echo "📋 Available commands:"
-echo "  update-flake          - Manage flake inputs and GitHub sync"
+echo "  update-flake          - Manage flake inputs"
 echo "  compare-modes         - Compare declarative vs writable modes"
 echo "  test-python-env       - Test Python virtual environment"
 echo "  test-quickshell       - Test quickshell with config"
 echo ""
 echo "🔄 Flake management:"
 echo "  update-flake status   - Show current flake status"
-echo "  update-flake update   - Update all flake inputs"
+echo "  update-flake update   - Update flake inputs"
 echo "  update-flake verify   - Test configurations build"
 echo ""
 echo "🎯 Build configurations:"
 echo "  nix build .#homeConfigurations.declarative.activationPackage"
 echo "  nix build .#homeConfigurations.writable.activationPackage"
 echo ""
-echo "🔑 Key insight: Both modes use the same Python venv and packages!"
+echo "📁 Local structure:"
+echo "  ./configs/            - All dots-hyprland configurations"
+echo "  ./modules/            - NixOS/Home Manager modules"
+echo "  ./packages/           - Utility scripts and packages"
+echo ""
+echo "🔑 Self-contained: No external dependencies on dots-hyprland repo!"
 echo "📁 Branch: $(git branch --show-current 2>/dev/null || echo 'unknown')"
 echo ""
-echo "💡 Run 'update-flake help' for full flake management options"
+echo "💡 Run 'update-flake help' for full options"