feat: migrate authentication to Appwrite and remove Better-Auth references

apps/server/src/routers/index.ts

@@ -7,7 +7,7 @@ export const appRouter = router({
   privateData: protectedProcedure.query(({ ctx }) => {
     return {
       message: "This is private",
-      user: ctx.session.user,
+      user: ctx.user,
     };
   }),
 });