Rebuild the hub on Bun: Elysia API, Better Auth, Drizzle, Next.js website

The hub becomes a Bun monorepo: apps/api (Elysia, Better Auth for accounts, roles, bans, proxy device
sign-in and JWT keys; tagline linking, presence and the console as before), packages/db (Drizzle; Postgres in
production, PGlite in development and tests), and the Next.js website from apps/web. Self-hostable with
docker compose; the website deploys to Vercel-style hosts, the API to any that runs Bun or containers. The
first version, in Go, is removed.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/api/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "target": "ES2022", "module": "ESNext", "moduleResolution": "bundler", "strict": true,
+    "noEmit": true, "skipLibCheck": true, "types": ["bun"], "noUncheckedIndexedAccess": true
+  },
+  "include": ["src", "test"]
+}