rewrite from monolithic hono jsx to react 19 spa with tanstack router
+ hono json api backend. add scan, review, execute, nodes, and setup
pages. multi-stage dockerfile (node for vite build, bun for runtime).
previously, server/ and src/shared/lib/ were silently excluded by
global gitignore patterns (/server/ from emacs, lib/ from python).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
