feat: streaming chat and dual view UI
This PR significantly enhances the frontend UX by implementing a streaming chat interface that displays the agent's thinking process in real-time. It introduces a "Dual View" toggle, allowing users to switch between a clean business summary and a detailed developer log (including SQL and execution stats). An About page is added, and backend prompt configuration paths are fixed to ensure synchronization with the settings UI.
PR created automatically by Jules for task 8420882297954235864 started by @MKY508
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