chore: initial commit - maqt-desktop v0.2

- Phase 1-5: UI framework, auth, weapon schemes, color filters, system optimization
- Industrial/tech design style with Chinese localization
- Points to gch3n.online/delta backend API
- Hardware monitor, filter editor, and all module pages

src/components/layout/DesktopIcon.tsx

@@ -0,0 +1,64 @@
+import React from 'react';
+
+interface DesktopIconProps {
+  icon: string;
+  label: string;
+  onClick?: () => void;
+  disabled?: boolean;
+  locked?: boolean;
+  vip?: boolean;
+  index?: number;
+}
+
+export default function DesktopIcon({ icon, label, onClick, disabled, locked, vip, index = 0 }: DesktopIconProps) {
+  const isBlocked = locked || disabled;
+
+  return (
+    <button
+      onClick={onClick}
+      disabled={disabled}
+      className="relative flex flex-col items-center justify-center gap-1.5 py-5 border border-[#333]
+        transition-colors duration-75 cursor-pointer disabled:cursor-not-allowed
+        hover:bg-[#222] hover:border-[#555] group"
+    >
+      {/* 坐标标记 */}
+      <span className="tech-sn absolute top-1 left-1 opacity-0 group-hover:opacity-100 transition-opacity">
+        X{index % 4}Y{Math.floor(index / 4)}
+      </span>
+
+      {/* 锁定遮罩 */}
+      {isBlocked && (
+        <div className="absolute inset-0 bg-[#1a1a1a]/80 flex items-center justify-center z-10">
+          <div className="flex flex-col items-center gap-1">
+            <span className="text-[#555] text-[12px]">🔒</span>
+            <span className="text-[7px] font-mono text-[#444] tracking-wider">
+              {vip ? 'VIP ONLY' : '需登录'}
+            </span>
+          </div>
+        </div>
+      )}
+
+      {/* 图标 */}
+      <span className={`material-symbols-outlined text-[24px] transition-colors duration-75
+        ${isBlocked ? 'text-[#444]' : 'text-[#888] group-hover:text-[#ff4500]'}`}>
+        {icon}
+      </span>
+
+      {/* 标签 */}
+      <span className={`text-[9px] font-semibold tracking-[0.12em] uppercase transition-colors duration-75
+        ${isBlocked ? 'text-[#444]' : 'text-[#555] group-hover:text-[#e0e0e0]'}`}>
+        {label}
+      </span>
+
+      {/* VIP 标记 */}
+      {vip && !isBlocked && (
+        <span className="absolute top-1.5 right-1.5 text-[7px] text-[#ff4500]">✦</span>
+      )}
+
+      {/* 底部强调线 */}
+      {!isBlocked && (
+        <span className="absolute bottom-0 left-1/4 right-1/4 h-[1px] bg-[#ff4500] scale-x-0 group-hover:scale-x-100 transition-transform duration-75" />
+      )}
+    </button>
+  );
+}