Add PBandGraphOauth scaffold and auth UI

node_modules/hono/dist/middleware/secure-headers/index.js

@@ -0,0 +1,6 @@
+// src/middleware/secure-headers/index.ts
+import { NONCE, secureHeaders } from "./secure-headers.js";
+export {
+  NONCE,
+  secureHeaders
+};