fix: serve buttplug locally in dev instead of Docker

Add a minimal Node.js static server (serve.mjs) to the buttplug package
that serves dist/ and wasm/ on port 8080 with correct MIME types.
Update dev:buttplug to use it instead of docker compose, avoiding a
full Rust/WASM Docker build on every dev start.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/buttplug/package.json

@@ -10,7 +10,8 @@
   ],
   "scripts": {
     "build": "vite build",
-    "build:wasm": "wasm-pack build --out-dir wasm --out-name index --target bundler --release"
+    "build:wasm": "wasm-pack build --out-dir wasm --out-name index --target bundler --release",
+    "serve": "node serve.mjs"
   },
   "dependencies": {
     "eventemitter3": "^5.0.4",