feat(portfolio): filter by service category (Consult / Web Dev) + multi-category support

Changes:
- Filter bar: old industry filters (🚗, 💊, etc.) replaced with service categories: All, Consult, Website Development
- Card categories updated per user spec:
  - Dataroot → consult only
  - เลือดจระเข้วานิไทย → both consult + webdev (multi-category)
  - All other 7 cards → webdev
- Filter JS updated: reads data-category (comma-sep) instead of industry text
- Multi-category via comma-separated values in data-category attribute
- Portfolio page: home + portfolio page both reflect new categories

public/site.webmanifest

@@ -0,0 +1,22 @@
+{
+  "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"
+}