feat: setup project infrastructure

- Create folder structure (server, client, install)
- Add server package.json with LiveKit SDK, Express, Opus
- Add client package.json with React, Vite, livekit-client
- Add macOS installation script with LiveKit binary download
- Add basic YAML config (1 group, 2 channels, audio quality settings)
- Add .gitignore for dependencies and binaries

client/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "ptt-live-client",
+  "version": "0.1.0",
+  "description": "PTT Live - Professional WebRTC Intercom Client PWA",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "lint": "eslint . --ext js,jsx --report-unused-disable-directives --max-warnings 0"
+  },
+  "dependencies": {
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "livekit-client": "^2.5.0"
+  },
+  "devDependencies": {
+    "@types/react": "^18.3.3",
+    "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.0",
+    "vite": "^5.2.11",
+    "vite-plugin-pwa": "^0.20.0",
+    "eslint": "^8.57.0",
+    "eslint-plugin-react": "^7.34.1",
+    "eslint-plugin-react-hooks": "^4.6.2",
+    "eslint-plugin-react-refresh": "^0.4.6"
+  },
+  "engines": {
+    "node": ">=20.0.0"
+  }
+}