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>

src/lib/slug.ts

@@ -0,0 +1,25 @@
+const TR_MAP: Record<string, string> = {
+  ç: 'c',
+  ğ: 'g',
+  ı: 'i',
+  İ: 'i',
+  ö: 'o',
+  ş: 's',
+  ü: 'u',
+  Ç: 'c',
+  Ğ: 'g',
+  Ö: 'o',
+  Ş: 's',
+  Ü: 'u',
+};
+
+/** Turkish-aware slugify: "Çift Bant Anten" → "cift-bant-anten". */
+export function slugify(input: string): string {
+  return input
+    .replace(/[çğıİöşüÇĞÖŞÜ]/g, (ch) => TR_MAP[ch] ?? ch)
+    .normalize('NFKD')
+    .replace(/[̀-ͯ]/g, '')
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, '-')
+    .replace(/^-+|-+$/g, '');
+}

src/pages/index.astro

@@ -1,16 +1,17 @@
 ---
+// Temporary placeholder; replaced by the real home page in stage 3.
+import '../styles/global.css';
 ---
 
-<html lang="en">
-	<head>
-		<meta charset="utf-8" />
-		<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
-		<link rel="icon" href="/favicon.ico" />
-		<meta name="viewport" content="width=device-width" />
-		<meta name="generator" content={Astro.generator} />
-		<title>Astro</title>
-	</head>
-	<body>
-		<h1>Astro</h1>
-	</body>
+<html lang="tr">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <meta name="viewport" content="width=device-width" />
+    <meta name="generator" content={Astro.generator} />
+    <title>TA1SPH</title>
+  </head>
+  <body>
+    <h1 class="p-8 text-4xl font-black">TA1SPH</h1>
+  </body>
 </html>

src/styles/global.css

@@ -0,0 +1,2 @@
+@import 'tailwindcss';
+@plugin '@tailwindcss/typography';