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>

biome.json

@@ -0,0 +1,20 @@
+{
+	"$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+	"organizeImports": {
+		"enabled": true
+	},
+	"formatter": {
+		"enabled": true,
+		"indentStyle": "tab",
+		"lineWidth": 100
+	},
+	"linter": {
+		"enabled": true,
+		"rules": {
+			"recommended": true
+		}
+	},
+	"files": {
+		"ignore": ["dist", "node_modules"]
+	}
+}