Implement native asyncio.wait_for wrapper around chromium new_context with brute-force init recovery to eliminate deep IPC silent locks

Fix Chromium Playwright hard hang on new_context by injecting --disable-dev-shm-usage and --disable-gpu container heuristics

chore: add frontend modularity refactor plan and update related files

Refactor browser service for parallel worker pool and deep research capabilities. Clean up redundant directories and fix potential path issues for .browser_data.