Add static registration page and static file serving

Added a new registration HTML page under data/static/register.html and introduced a static file serving route in routes/static.js. Minor adjustments were made to authRepository.js and userRepository.js to update module imports. This enables serving static assets and provides a registration UI.

routes/static.js

@@ -0,0 +1,7 @@
+const path = require("node:path")
+const expres = require("express")
+const router = expres.Router() 
+
+router.use(expres.static(path.join(process.cwd(), "data", "static")))
+
+module.exports = router