chore: monorepo scaffold, CI, MIT license

Bun workspaces (server/web/shared), typecheck+test gates, Gitea CI.
Refs PAI-90.

README.md

@@ -0,0 +1,12 @@
+# Helios
+
+Self-hosted, open-source health companion — a FOSS alternative to closed
+"24/7 AI health companion" products. Your data stays on your server; the
+AI runs on a key you provide (OpenRouter, or Ollama for zero third parties).
+
+Status: pre-alpha scaffold. See docs/superpowers/specs/ for the design.
+
+## Develop
+
+    bun install
+    bun run typecheck && bun test