feat: Minecraft Clone MVP – prozedurale Welt, Blöcke, Abbauen/Setzen

- Weltgenerierung: FBM-Terrain, 3 Biome (Plains/Wald/Wüste), Höhlen, Wasser, Bäume
- Blöcke: Grass, Dirt, Stein, Sand, Holz, Blätter, Wasser (+Bedrock)
- Interaktion: DDA-Voxel-Raycast, Abbauen (LMB) & Setzen (RMB), Hotbar 1-6
- Spieler: First-Person, Gravitation, AABB-Kollision, Springen, Fly-Mode (F)
- Engine: Chunk-Streaming (16x16x64), Face-Culling, opaker+transparenter Pass
- Stack: Three.js + simplex-noise via CDN, prozedurale Texturen, kein Build-Step

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

index.html

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+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
+  <title>Minecraft Clone</title>
+  <link rel="stylesheet" href="style.css" />
+  <script type="importmap">
+  {
+    "imports": {
+      "three": "https://cdn.jsdelivr.net/npm/three@0.165.0/build/three.module.js",
+      "simplex-noise": "https://cdn.jsdelivr.net/npm/simplex-noise@4.0.1/dist/esm/simplex-noise.js"
+    }
+  }
+  </script>
+</head>
+<body>
+  <!-- Lade-/Start-Overlay -->
+  <div id="overlay">
+    <div class="panel">
+      <h1>Minecraft Clone</h1>
+      <p>Klicke, um zu starten.</p>
+      <div class="keys">
+        <div><b>WASD</b> Laufen &nbsp; <b>Leertaste</b> Springen</div>
+        <div><b>Maus</b> Umsehen &nbsp; <b>Shift</b> Sneak / Runter (Fly)</div>
+        <div><b>Linke Maustaste</b> Abbauen &nbsp; <b>Rechte Maustaste</b> Setzen</div>
+        <div><b>F</b> Flug-Modus &nbsp; <b>1–6</b> Block wählen &nbsp; <b>Esc</b> Pause</div>
+      </div>
+    </div>
+  </div>
+
+  <!-- Crosshair -->
+  <div id="crosshair"></div>
+
+  <!-- Hotbar -->
+  <div id="hotbar"></div>
+
+  <!-- Debug-HUD -->
+  <div id="hud"></div>
+
+  <script type="module" src="js/main.js"></script>
+</body>
+</html>