Initial commit: code playground with multi-framework support

Express + SQLite backend with Monaco editor frontend.
Supports HTML/CSS/JS, TypeScript, React (JSX/TSX), Vue SFC,
and Svelte with live preview, console output, save/fork/share.

Includes CSS preprocessors (SCSS, Less), framework-specific
compilation (Babel, TypeScript, Svelte compiler), and
CDN-loaded runtime libraries for preview rendering.

package.json

@@ -0,0 +1,16 @@
+{
+  "name": "fiddle",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "better-sqlite3": "^11.0.0",
+    "express": "^4.21.0",
+    "nanoid": "^5.0.0"
+  },
+  "devDependencies": {
+    "svelte": "^4.2.19"
+  }
+}