Prepare for public launch: README and title, SafeSearch and family-DNS filter, friendly quota message, Triton tuning cache, 4 browsers, shorter suggestions

Run GPU calls from the web agent and screenshot views as Gradio events (fixes ZeroGPU 'runs limit')

Web agent view (Qwen3.6-27B-FP8 planner + DeskForge-Qwen3.5-4B) on top of the live desktop duel