Authenticated remote gateway for DeepSeek Harness

Key features

• This plugin is "Accredited Remote Exposures": The gateway is certified at an independent port and goes back to loopback.
• Remote qrCast a new one-time pair (QR URL + ASCII diagram + short code + residual validity) - "Give me a pair."
• Non-loopback bound without password and closed pairs ⁇ refused to load.
• The gateway is now being injected into the browser on demand by WS ping (only at frame boundaries, only free time), avoiding disconnection from root causes