perf: convert all images to webp, update references

- 77 jpg/png/gif → webp (kept 7 where webp larger)
- public/ assets: 23.3 MB → ~12 MB (~50% smaller)
- 110 image references updated across data files + components
- scripts/convert-to-webp.mjs + scripts/fix-image-refs.mjs added

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/data/industries.ts

@@ -90,7 +90,7 @@ export const INDUSTRIES: Industry[] = [
     matchCategories: ['humanoid', 'service'],
     accent: '#8891C7',
     icon: 'graduation-cap',
-    image: '/images/robots/unitree-h1.jpg',
+    image: '/images/robots/unitree-h1.webp',
     imageAlt: 'Humanoid research robot in a UAE STEM lab',
   },
   {
@@ -103,7 +103,7 @@ export const INDUSTRIES: Industry[] = [
     matchCategories: ['quadruped', 'commercial'],
     accent: '#DEE0F0',
     icon: 'shield',
-    image: '/industries/cards/security-surveillance.jpg',
+    image: '/industries/cards/security-surveillance.webp',
     imageAlt: 'Quadruped robot on autonomous security patrol at a UAE facility',
   },
   {
@@ -155,7 +155,7 @@ export const INDUSTRIES: Industry[] = [
     matchCategories: ['humanoid', 'quadruped', 'service'],
     accent: '#273F94',
     icon: 'landmark',
-    image: '/industries/unitree/utility-room.jpg',
+    image: '/industries/unitree/utility-room.webp',
     imageAlt: 'Quadruped robots deployed for UAE civic and emergency services',
   },
 ];