fix(cli): use createFileRoute in tanstack start + convex + better-auth

Author: AmanVarshney01

apps/cli/templates/auth/better-auth/convex/web/react/tanstack-start/src/routes/api/auth/$.ts.hbs

@@ -1,11 +1,11 @@
-import { reactStartHandler } from '@convex-dev/better-auth/react-start'
-import { createServerFileRoute } from '@tanstack/react-start/server'
+import { reactStartHandler } from "@convex-dev/better-auth/react-start";
+import { createFileRoute } from "@tanstack/react-router";
 
-export const ServerRoute = createServerFileRoute('/api/auth/$').methods({
-    GET: ({ request }) => {
-        return reactStartHandler(request)
+export const Route = createFileRoute("/api/auth/$")({
+  server: {
+    handlers: {
+      GET: ({ request }) => reactStartHandler(request),
+      POST: ({ request }) => reactStartHandler(request),
     },
-    POST: ({ request }) => {
-        return reactStartHandler(request)
-    },
-})
+  },
+});