fix(build): make oRPC/tRPC dist runnable under node ESM (deploy crashloop)

flake.nix only rewrote @/ aliases but left extensionless relative imports
(./router) in compiled dist/. node dist/index.js (how prod runs) cannot
resolve extensionless ESM specifiers -> ERR_MODULE_NOT_FOUND -> backend
crashlooped (444 restarts, port 4001 dead). Extract the fixer into a shared
scripts/fix-imports.mjs that appends .js to extensionless relative imports and
rewrites @/ aliases, and wire it into backend + discord-gateway build phases.

Verified: fresh tsc + fixer -> node dist/index.js boots; oRPC over /trpc
serves both HTTP POST and WebSocket (config/dashboard/voice/moderation/
media/chatbot/analysis) end-to-end against Postgres + Redis. next build
passes with the oRPC client + partysocket.

services/frontend/src/lib/api/recordings.ts

@@ -1,4 +1,4 @@
-import { trpc } from "@/lib/trpc/client";
+import { orpc } from "@/lib/orpc/client";
 import type { PaginatedRecordings } from "@/lib/types";
 
 export const recordingsApi = {
@@ -8,7 +8,7 @@ export const recordingsApi = {
     userId?: string,
     cursor?: string,
   ) =>
-    trpc.recordings.list.query({
+    orpc.recordings.list({
       limit,
       channelId,
       userId,
@@ -16,7 +16,5 @@ export const recordingsApi = {
     }) as unknown as Promise<PaginatedRecordings>,
 
   delete: (id: string) =>
-    trpc.recordings.delete.mutate({ id }) as unknown as Promise<{
-      ok: boolean;
-    }>,
+    orpc.recordings.delete({ id }) as unknown as Promise<{ ok: boolean }>,
 };