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/dashboard.ts

@@ -1,4 +1,4 @@
-import { trpc } from "@/lib/trpc/client";
+import { orpc } from "@/lib/orpc/client";
 import type {
   DashboardActivity,
   DashboardChannelDetail,
@@ -11,45 +11,40 @@ import type {
 } from "@/lib/types";
 
 export const dashboardApi = {
-  getStats: () =>
-    trpc.dashboard.stats.query() as unknown as Promise<DashboardStats>,
+  getStats: () => orpc.dashboard.stats() as unknown as Promise<DashboardStats>,
 
   getActivity: (days = 14) =>
-    trpc.dashboard.activity.query({
-      days,
-    }) as unknown as Promise<DashboardActivity>,
+    orpc.dashboard.activity({ days }) as unknown as Promise<DashboardActivity>,
 
   listUsers: (limit?: number, cursor?: string, search?: string) =>
-    trpc.dashboard.users.query({
+    orpc.dashboard.users({
       limit,
       cursor,
       search,
     }) as unknown as Promise<PaginatedUsers>,
 
   getUserDetail: (userId: string) =>
-    trpc.dashboard.userDetail.query({
+    orpc.dashboard.userDetail({
       userId,
     }) as unknown as Promise<DashboardUserDetail>,
 
   listChannels: (limit?: number, search?: string, guildId?: string) =>
-    trpc.dashboard.channels.query({
+    orpc.dashboard.channels({
       limit,
       search,
       guildId,
     }) as unknown as Promise<PaginatedChannels>,
 
   getChannelDetail: (channelId: string) =>
-    trpc.dashboard.channelDetail.query({
+    orpc.dashboard.channelDetail({
       channelId,
     }) as unknown as Promise<DashboardChannelDetail>,
 
   getTopReactions: (limit = 20) =>
-    trpc.dashboard.reactions.query({ limit }) as unknown as Promise<
+    orpc.dashboard.reactions({ limit }) as unknown as Promise<
       TopReactedMessage[]
     >,
 
   getTopReactors: (limit = 20) =>
-    trpc.dashboard.reactors.query({ limit }) as unknown as Promise<
-      TopReactor[]
-    >,
+    orpc.dashboard.reactors({ limit }) as unknown as Promise<TopReactor[]>,
 };