merge: merge color-heading-optimization into feat-init

- Add color contrast optimization and checking tools
- Add heading hierarchy guidelines and checker
- Resolve package-lock.json conflict (keeping feat-init version)

package.json

@@ -10,6 +10,8 @@
     "test": "playwright test",
     "test:smoke": "playwright test --grep @smoke",
     "test:report": "allure generate test-results/allure-results && allure open",
+    "check:contrast": "tsx scripts/check-color-contrast.ts",
+    "check:headings": "tsx scripts/check-heading-hierarchy.ts",
     "audit:performance": "node scripts/performance-audit.js",
     "audit:seo": "node scripts/seo-check.js",
     "audit:accessibility": "node scripts/accessibility-test.js",
@@ -19,6 +21,7 @@
   },
   "dependencies": {
     "@antv/g2": "^5.4.8",
+    "@playwright/test": "^1.58.2",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
     "@types/three": "^0.183.1",
@@ -48,6 +51,7 @@
     "eslint-config-next": "^0.2.4",
     "lighthouse": "^13.0.3",
     "tailwindcss": "^4",
+    "tsx": "^4.21.0",
     "typescript": "^5"
   }
 }