Implement rich NixOS configuration system

✅ COMPLETE: Full NixOS-style configuration system implemented

🎯 Features:
- Rich configuration options for Quickshell, Hyprland, and Terminal
- Type-safe NixOS module options with defaults and descriptions
- Generated configuration files from Nix expressions
- Example configurations (gaming, productivity, minimalist)
- Comprehensive documentation

🔧 Configuration Modules:
- modules/components/quickshell-config.nix - Quickshell options
- modules/components/hyprland-config.nix - Hyprland options
- modules/components/terminal-config.nix - Terminal options

📝 Example Usage:
programs.dots-hyprland = {
  quickshell.bar.utilButtons.showColorPicker = true;
  hyprland.general.gapsIn = 6;
  terminal.colors.alpha = 0.90;
};

🎨 Generated Files:
- ~/.config/quickshell/ii/modules/common/Config.qml (NixOS-managed)
- ~/.config/hypr/general.conf (NixOS-managed)
- ~/.config/foot/foot.ini (NixOS-managed)

✅ Tested: All configurations build and activate successfully
🎉 Ready for production use with full NixOS declarative configuration!

examples/productivity-config.nix

@@ -0,0 +1,93 @@
+# Productivity-focused configuration for dots-hyprland
+{ config, lib, pkgs, ... }:
+
+{
+  programs.dots-hyprland = {
+    enable = true;
+    source = ./configs;
+    packageSet = "essential";
+    mode = "declarative";
+    
+    # 💼 Productivity-optimized settings
+    quickshell = {
+      appearance = {
+        transparency = true;  # Nice visual effects
+        fakeScreenRounding = 2;
+      };
+      
+      bar = {
+        bottom = false;  # Top bar for traditional feel
+        cornerStyle = 1;  # Float style
+        showBackground = true;
+        verbose = true;  # Show detailed info
+        
+        utilButtons = {
+          showScreenSnip = true;  # Essential for productivity
+          showColorPicker = true;  # Useful for design work
+          showMicToggle = true;  # For meetings
+          showKeyboardToggle = true;
+          showDarkModeToggle = true;
+          showPerformanceProfileToggle = false;
+        };
+        
+        workspaces = {
+          shown = 10;  # Many workspaces for organization
+          showAppIcons = true;
+          alwaysShowNumbers = true;  # Always show for quick navigation
+          showNumberDelay = 100;  # Quick response
+        };
+      };
+      
+      battery = {
+        low = 25;  # Higher threshold for work
+        critical = 10;
+        automaticSuspend = true;
+        suspend = 5;  # Longer suspend delay
+      };
+      
+      apps = {
+        terminal = "foot";
+        taskManager = "plasma-systemmonitor --page-name Processes";
+      };
+      
+      time = {
+        format = "HH:mm:ss";  # 24-hour with seconds
+        dateFormat = "dddd, MMMM dd, yyyy";  # Full date
+      };
+    };
+    
+    hyprland = {
+      general = {
+        gapsIn = 6;  # Comfortable gaps
+        gapsOut = 10;
+        borderSize = 2;
+        allowTearing = false;  # Smooth visuals
+      };
+      
+      decoration = {
+        rounding = 12;  # Moderate rounding
+        blurEnabled = true;  # Nice visual effects
+      };
+      
+      gestures = {
+        workspaceSwipe = true;  # Efficient navigation
+      };
+    };
+    
+    terminal = {
+      scrollback = {
+        lines = 10000;  # Large scrollback for logs
+        multiplier = 3.0;
+      };
+      
+      cursor = {
+        style = "beam";
+        blink = true;  # Visible cursor
+      };
+      
+      colors = {
+        alpha = 0.90;  # Slight transparency
+      };
+    };
+  };
+}