feat(remix): support serving app under a sub-path via NEXT_PUBLIC_BASE_PATH (#2824)

apps/remix/server/trpc/hono-trpc-remix.ts

@@ -1,3 +1,4 @@
+import { formatPath } from '@documenso/lib/constants/app';
 import { createTrpcContext } from '@documenso/trpc/server/context';
 import { appRouter } from '@documenso/trpc/server/router';
 import { handleTrpcRouterError } from '@documenso/trpc/utils/trpc-error-handler';
@@ -5,10 +6,14 @@ import { trpcServer } from '@hono/trpc-server';
 
 /**
  * Trpc server for internal routes like /api/trpc/*
+ *
+ * `endpoint` must include the sub-path prefix (e.g. "/ESign") because the
+ * @hono/trpc-server adapter slices the prefix off the full URL pathname to
+ * compute the procedure name. Hono's `basePath` doesn't rewrite the URL.
  */
 export const reactRouterTrpcServer = trpcServer({
   router: appRouter,
-  endpoint: '/api/trpc',
+  endpoint: formatPath('/api/trpc'),
   createContext: async (_, c) => createTrpcContext({ c, requestSource: 'app' }),
   onError: (opts) => handleTrpcRouterError(opts, 'trpc'),
 });