V.C. Billingsley2/20/2026, 5:44:16 AM

Implement server.mjs as the unified backend: serves Vite in dev via
createServer middleware, handles production static files, and provides
the full GitHub OAuth flow (/auth/github, /auth/github/callback,
/auth/logout, /api/me). Session state is stored in a signed cookie
so no external session store is needed. The callback redirects to
/#authenticated so the frontend can detect a successful login.

Also exposes /api/repos (list user repos via GitHub API), /api/parse
(clone + parse a repo into a graph), and /api/detect-src (auto-detect
source directory). This is the minimal backend needed to support
authenticated repo visualization.

Parent925f955