feat: liquid glass UI, blob background, redesign home/portfolio/about pages

- Liquid glass effect on navbar/cards with backdrop-filter invert
- Animated blob gradient background (SVG-based)
- Portfolio section: scene-dark invert, show 5 items on home
- How Work section: step flow with numbers + connecting lines
- Hero: Decision snapshot replacing problem selector
- About page: inverted background with contrast fixes
- Fix parallax JS bundling via Astro
- Fix navbar fixed positioning after liquid glass CSS
- Submenu hover fix
- Clean up removed legacy files/assets

redesign-input/assets/portfolio/DEALPLUSTECH.md

@@ -0,0 +1,15 @@
+# Dealplustech Portfolio Asset
+
+Dealplustech is included in the rebuilt website portfolio.
+
+- URL: https://www.dealplustech.co.th
+- Homepage screenshot captured: `dealplustech.png`
+- Screenshot status: clean homepage capture with header/menu visible and cookie banner removed.
+- Target style: same portfolio-image treatment as existing clients
+- Output filename: `dealplustech.png`
+
+Notes:
+
+- Dealplustech is a new client.
+- It should appear as website portfolio work.
+- It can also support consulting-adjacent credibility, but should not replace Dataroot main diagnosis story.