migrate to app dir and ssr

apps/web/src/app/api/trpc/[trpc]/route.ts

@@ -0,0 +1,18 @@
+import { appRouter } from '@/server/api/root';
+import { getSession } from '@/server/auth';
+import { fetchRequestHandler } from '@trpc/server/adapters/fetch';
+
+const handler = (req: Request) =>
+  fetchRequestHandler({
+    endpoint: '/api/trpc',
+    req,
+    router: appRouter,
+    createContext: async () => {
+      const session = await getSession();
+      return {
+        session,
+      };
+    },
+  });
+
+export { handler as GET, handler as POST };