feat(01-01): scaffold Vite project with CSS design system and project structure

- Vite 6 + TypeScript + Biome + Vitest configured
- All directories from spec section 13 created
- CSS custom properties for full color palette and finger colors
- index.html with 5 screen sections and Google Fonts
- Dev server binds to 0.0.0.0:5173 for VPS access

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -1 +1,11 @@
+# Dependencies
+node_modules
+
+# Build output
+dist
+
+# API config (contains secrets)
 public/config.json
+
+# Local env files
+*.local