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

public/site.webmanifest

@@ -1,22 +0,0 @@
-{
-  "name": "MoreminiMore",
-  "short_name": "MoreminiMore",
-  "description": "ที่ปรึกษาที่วางกลยุทธ์จากข้อมูล ไม่ใช่จากประสบการณ์ล้วน ๆ — รับทำเว็บ ที่ปรึกษาการตลาด และวางระบบ AI ในองค์กร",
-  "icons": [
-    {
-      "src": "/android-chrome-192x192.png",
-      "sizes": "192x192",
-      "type": "image/png"
-    },
-    {
-      "src": "/android-chrome-512x512.png",
-      "sizes": "512x512",
-      "type": "image/png"
-    }
-  ],
-  "theme_color": "#fed400",
-  "background_color": "#ffffff",
-  "display": "standalone",
-  "start_url": "/",
-  "lang": "th"
-}