feat(game-card): Satori route handler returning 1080×1080 PNG

[brianespinosa]

Summary

• Replaces page.tsx + client-side GameCard components with a route.tsx route handler at the same URL returning image/png via next/og ImageResponse
• Adds src/lib/og/fonts.ts for WOFF font loading and src/lib/og/fitText.ts for opentype.js glyph-width-based font sizing
• Team name rows are width-matched: Arsenal's row and the "vs Opponent" row are sized so both render at equal pixel widths using getAdvanceWidth closed-form calculation
• Adds ?simulate=away query param for testing the away fixture layout (AwayBg) without needing a real away fixture
• Removes GameCard component directory, page.tsx, loading.tsx, and orphaned bg SVGs
• Removes react-textfit / @types/react-textfit; adds opentype.js

Still pending

• Branch logo drop shadow — Satori CSS filter: drop-shadow() clips to element paint area; SVG-native feDropShadow is not rendering. Current state uses box-shadow with borderRadius: 50% as an approximation. Needs more investigation tomorrow.
• Visual verification across all six branch domains
• Vercel preview deploy verification

Test plan

• curl -I http://localhost:3000/tacomagooners.com/game-card — Content-Type: image/png
• curl -o /tmp/card.png http://localhost:3000/tacomagooners.com/game-card && open /tmp/card.png — inspect 1080×1080
• ?simulate=away variant for away layout
• Repeat for all six branch domains
• yarn build && yarn start — no build errors