feat: monochrome black & white rebrand + new Pudu robots

- Convert site from royal-blue theme to black/white monochrome (desaturate
  all blue-hued colors; keep WhatsApp green and error red)
- Swap blue circular brand logo for mono YS mark; regenerate favicon/PWA icons
- Add 6 Pudu robots (CC1 Pro, MT1 Max, MT1 Vac, T600, T600 Underride, BG1 Pro)
- Fix favicon.ico to RGBA (Next 16 Turbopack decode) and Stripe apiVersion type

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/components/robotics/InquiryForm.tsx

@@ -63,9 +63,9 @@ export function InquiryForm({ defaultRobot = '', defaultCategory = '', intent =
     width: '100%',
     padding: '0.875rem 1rem',
     borderRadius: '0.75rem',
-    border: '1px solid rgba(39, 63, 148,0.18)',
+    border: '1px solid rgba(94, 94, 94, 0.18)',
     background: 'rgba(15, 12, 8,0.55)',
-    color: '#FBFBFD',
+    color: '#fcfcfc',
     fontSize: '0.95rem',
     outline: 'none',
     boxSizing: 'border-box',
@@ -77,7 +77,7 @@ export function InquiryForm({ defaultRobot = '', defaultCategory = '', intent =
     fontSize: '0.72rem',
     letterSpacing: '0.18em',
     textTransform: 'uppercase',
-    color: '#8891C7',
+    color: '#a8a8a8',
     fontWeight: 600,
   };