Remove hard timeouts and fallback paths in chat flow

Frontend/server/api/omni/delivery/enqueue.post.ts

@@ -9,7 +9,6 @@ type EnqueueBody = {
   method?: "POST" | "PUT" | "PATCH";
   headers?: Record<string, string>;
   payload?: unknown;
-  timeoutMs?: number;
   provider?: string;
   channel?: string;
   attempts?: number;
@@ -44,7 +43,6 @@ export default defineEventHandler(async (event) => {
       method: body?.method ?? "POST",
       headers: body?.headers ?? {},
       payload: body?.payload ?? {},
-      timeoutMs: body?.timeoutMs,
       provider: body?.provider ?? undefined,
       channel: body?.channel ?? undefined,
     },