Add Node.js unified proxy and process manager

[Copilot]

Creates a native Node.js proxy that unifies Gradio UI, React UI, and update status page under a single host with path-based routing.

Changes

• installer_scripts/js/unifiedProxy.js - HTTP/WebSocket proxy using only native Node.js modules

  • Routes /gradio/* → port 7770, /update/* → port 7771, /* → port 3000
  • Handles WebSocket upgrades for Gradio's real-time communication
  • Rewrites paths and headers when forwarding to backends

• installer_scripts/js/processManager.js - Process lifecycle manager

  • Spawns Gradio (Python), React UI (Next.js), and update server
  • Waits for each service to become available before proceeding
  • Graceful shutdown via SIGINT/SIGTERM

• installer_scripts/start_unified.{bat,sh} - Platform start scripts

• installer_scripts/js/index.html - Updated to use relative URLs for /update prefix compatibility

• installer_scripts/js/server.js - Added skipBrowser option to prevent double browser opening

Usage

# Full stack via process manager
node installer_scripts/js/processManager.js

# Proxy only (services running separately)
node installer_scripts/js/unifiedProxy.js

# Flags: --no-gradio, --no-react, --no-update, --proxy-only, --no-browser

Default proxy port: 7860 (configurable via PROXY_PORT env var)

Original prompt

Create a node.js proxy and process manager that unifies 1. automatic update status page 2. gradio UI and 3. react UI into a single host. Note that gradio has more than just HTTP requests. The resulting mounting URLs should be /gradio for gradio and /update for update and / for react. This script should rely on node.js not on npm packages. Read start_tts_webui.bat to see how the app is launched and bootstrapped.

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