add empty chat endpoint

apps/chat/README.md

@@ -0,0 +1,27 @@
+# chat
+
+Chat worker served at `chat.rec.djdevin.net`.
+
+- `GET /` — service status `{ "service": "chat", "status": "ok" }`.
+- `GET /thread` — chat threads. No DB binding yet, so returns `[]` (matching the
+  C# `ChatController.Get`).
+
+## Development
+
+### Run in dev mode
+
+```sh
+pnpm dev
+```
+
+### Run tests
+
+```sh
+pnpm test
+```
+
+### Deploy
+
+```sh
+pnpm turbo deploy
+```