feat: implement SEO enhancements and sitemap generation

- Added comprehensive SEO meta tags in index.html for improved search engine visibility, including Open Graph and Twitter Card tags.
- Created a sitemap.xml for better indexing of site tools, generated automatically via a new script (generate-sitemap.ts).
- Introduced robots.txt to manage crawler access and specified sitemap location.
- Updated package.json to include a build step for sitemap generation and added tsx as a dependency.
- Documented SEO optimizations and usage instructions in a new SEO-README.md file.

package.json

@@ -5,7 +5,8 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
-    "build": "tsc -b && vite build",
+    "build": "npm run generate:sitemap && tsc -b && vite build",
+    "generate:sitemap": "tsx scripts/generate-sitemap.ts",
     "lint": "eslint .",
     "preview": "vite preview",
     "release:patch": "npm version patch && git push --follow-tags",
@@ -43,6 +44,7 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.22",
     "globals": "^16.4.0",
+    "tsx": "^4.19.2",
     "tw-animate-css": "^1.4.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.45.0",
@@ -53,7 +55,8 @@
       "vite": "npm:rolldown-vite@7.1.14"
     },
     "onlyBuiltDependencies": [
-      "@swc/core"
+      "@swc/core",
+      "esbuild"
     ]
   }
 }