Update skills: add website-creator, mql-developer, ecommerce-astro

Changes:
- Add FAL_KEY and GEMINI_API_KEY to .env.example
- Update picture-it to use ~/.config/opencode/.env (unified creds)
- Remove shodh-memory skill (no longer used)
- Remove alphaear-* skills (deprecated)
- Remove thai-frontend-dev skill (replaced by website-creator)
- Remove theme-factory skill
- Add mql-developer skill (MQL5 trading)
- Add ecommerce-astro skill (Astro e-commerce)
- Add website-creator skill (Next.js + Payload CMS)
- Update install script for new skills

skills/ecommerce-astro/scripts/templates/src/components/checkout/CheckoutSingleItemDark.tsx

@@ -0,0 +1,29 @@
+interface CheckoutSingleItemDarkProps {
+  thumb_src: string;
+  thumb_alt: string;
+  title: string;
+  color?: string;
+  size?: string;
+  price: number;
+}
+
+export default function CheckoutSingleItemDark({ thumb_src, thumb_alt, title, color, size, price }: CheckoutSingleItemDarkProps) {
+  return (
+    <div className="flex gap-4 py-4 border-b border-gray-700">
+      <img
+        src={thumb_src}
+        alt={thumb_alt}
+        className="w-20 h-20 object-cover rounded-lg"
+      />
+      <div className="flex-1">
+        <h4 className="font-medium text-white">{title}</h4>
+        {(color || size) && (
+          <p className="text-sm text-gray-400">
+            {[color, size].filter(Boolean).join(' / ')}
+          </p>
+        )}
+        <p className="font-bold mt-1 text-green-400">฿{price.toLocaleString()}</p>
+      </div>
+    </div>
+  );
+}