feat: scaffold Astro 7 with Tailwind 4, MDX, sitemap, node adapter and tooling

- Tailwind v4 via @tailwindcss/vite + typography plugin
- astro-icon (Tabler), self-hosted Rubik/Inter, RSS, Pagefind postbuild
- Prettier (astro + tailwind plugins), editorconfig
- new:post script with Turkish-aware slugify

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -7,11 +7,35 @@
   },
   "scripts": {
     "dev": "astro dev",
-    "build": "astro build",
+    "build": "astro build && pagefind --site dist/client",
+    "check": "astro check",
     "preview": "astro preview",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
+    "new:post": "node scripts/new-post.mjs",
     "astro": "astro"
   },
   "dependencies": {
-    "astro": "^7.4.0"
+    "@astrojs/markdown-satteri": "^0.4.4",
+    "@astrojs/mdx": "^8.1.0",
+    "@astrojs/node": "^11.1.8",
+    "@astrojs/rss": "^4.0.19",
+    "@astrojs/sitemap": "^3.7.4",
+    "@fontsource-variable/inter": "^5.3.0",
+    "@fontsource-variable/rubik": "^5.3.0",
+    "@iconify-json/tabler": "^1.2.42",
+    "@tailwindcss/vite": "^4.3.3",
+    "astro": "^7.4.0",
+    "astro-icon": "^1.2.0",
+    "tailwindcss": "^4.3.3"
+  },
+  "devDependencies": {
+    "@astrojs/check": "^0.9.10",
+    "@tailwindcss/typography": "^0.5.20",
+    "pagefind": "^1.5.2",
+    "prettier": "^3.9.10",
+    "prettier-plugin-astro": "^1.1.1",
+    "prettier-plugin-tailwindcss": "^0.8.1",
+    "typescript": "^6.0.3"
   }
-}
+}