feat(fsharp): Fable browser platform, snake and pong pages, build-web.sh

Co-Authored-By: Claude Opus 5.5 <[email protected]>

fsharp/pong.html

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+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Pure Pong</title>
+  <link rel="icon" href="data:,">
+  <style>
+    body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; align-items: center;
+           justify-content: center; gap: 12px; background: #1b1b1b; color: #ddd; font: 14px system-ui, sans-serif; }
+    h1 { margin: 0; font-size: 20px; }
+    canvas { background: #111111; border: 2px solid #333; }
+    p { margin: 0; color: #999; }
+  </style>
+</head>
+<body>
+  <h1>Pure Pong</h1>
+  <canvas id="game" width="640" height="400"></canvas>
+  <p>Up/Down arrows (or W/S) move your paddle. First to 5 wins. R restarts.</p>
+  <script type="module" src="web/dist/PongMain.js"></script>
+</body>
+</html>