Add YouTube Music now-playing server, OBS overlay, and browser extension

Node.js server on port 9095 receives now-playing data via POST and broadcasts
to connected WebSocket clients. Includes a Firefox/Chrome extension that scrapes
YouTube Music's player bar every 3s, an OBS-ready transparent overlay with
animated equalizer bars, and an image proxy to bypass CDN restrictions in OBS.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,17 @@
+{
+  "name": "ytmusic-now-playing",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node server/index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^5.2.1",
+    "ws": "^8.20.0"
+  }
+}