fix: unblock query cache mutations in demo mode and add cache buster (#6176)

packages/api/src/trpc.ts

@@ -116,6 +116,8 @@ const baseProcedure = env.DEMO_MODE ? t.procedure.use(enforceDemoModeReadOnly) :
  */
 export const publicProcedure = baseProcedure;
 
+export const internalProcedure = t.procedure;
+
 const enforceUserIsAuthed = t.middleware(({ ctx, next }) => {
   if (!ctx.session?.user) {
     throw new TRPCError({ code: "UNAUTHORIZED" });