Initial commit: Dostalgia — DOS game hub

- Go backend (single binary) with embedded Svelte frontend
- JSON-per-game storage (no database)
- .jsdos bundle creation on upload
- Dark phosphor-green theme (#33FF33)
- js-dos v8 emulator integration
- Sockdrive support for games >80MB
- IGDB placeholder for future artwork scraping
- Docker deployment ready

frontend/src/App.svelte

@@ -0,0 +1,63 @@
+<script>
+  import "./app.css";
+  import Header from "./lib/Header.svelte";
+  import Library from "./pages/Library.svelte";
+  import GameDetail from "./pages/GameDetail.svelte";
+  import Play from "./pages/Play.svelte";
+
+  let route = $state("/");
+  let gameId = $state(null);
+
+  function parseHash() {
+    const hash = window.location.hash.slice(1) || "/";
+    const parts = hash.split("/").filter(Boolean);
+    if (parts.length === 0 || (parts.length === 1 && parts[0] === "")) {
+      route = "/";
+      gameId = null;
+    } else if (parts[0] === "game" && parts[1]) {
+      route = "/game";
+      gameId = parts[1];
+    } else if (parts[0] === "play" && parts[1]) {
+      route = "/play";
+      gameId = parts[1];
+    } else {
+      route = "/";
+      gameId = null;
+    }
+  }
+
+  // Listen for hash changes
+  $effect(() => {
+    parseHash();
+    const handler = () => parseHash();
+    window.addEventListener("hashchange", handler);
+    return () => window.removeEventListener("hashchange", handler);
+  });
+</script>
+
+<Header />
+
+<main class="container">
+  {#if route === "/"}
+    <Library />
+  {:else if route === "/game" && gameId}
+    <GameDetail id={gameId} />
+  {:else if route === "/play" && gameId}
+    <Play id={gameId} />
+  {:else}
+    <div class="empty">
+      <h2>Page not found</h2>
+      <a href="#/">Back to Library</a>
+    </div>
+  {/if}
+</main>
+
+<style>
+  .empty {
+    text-align: center;
+    padding: 80px 20px;
+  }
+  .empty h2 {
+    margin-bottom: 16px;
+  }
+</style>