chore: update project configurations and add Prettier settings

package.json

@@ -7,7 +7,9 @@
     "build": "astro build",
     "preview": "astro preview",
     "start": "astro dev --host",
-    "lint": "astro check"
+    "lint": "astro check",
+    "format": "prettier --write .",
+    "format:check": "prettier --check ."
   },
   "dependencies": {
     "@astrojs/check": "^0.9.4",
@@ -36,7 +38,10 @@
     "@types/react-dom": "^19.0.4",
     "eslint": "^9",
     "eslint-config-next": "15.1.7",
+    "eslint-config-prettier": "^10.1.1",
     "postcss": "^8",
+    "prettier": "^3.5.3",
+    "prettier-plugin-astro": "^0.14.1",
     "tailwindcss": "^4.0.12",
     "typescript": "^5.7.3"
   }