fix(gateway): enable stream for all LLM calls — router always streams SSE

Audit lanjutan: 6x 'LLM API request failed: Request was aborted' per jam.
Root cause: 9router/omniroute SELALU balas SSE (data: chunks) walau request
tanpa stream:true — SDK OpenAI non-stream menunggu FULL body sebelum parse,
jadi batch moderasi besar yang upstream-nya lambat kena timeout 30-60s dan
di-abort. llmClient sudah punya agregasi streaming (chunks → ChatCompletion).

Fix: stream:true di llmCaller (moderasi batch/individual), llmVision,
cultureLearner, userProfileLearner. Verified: SDK stream test 806ms vs
sebelumnya abort. Caller lain (recovery worker dll) lewat llmCaller sama.

services/discord-gateway/src/modules/ai-moderation/llmCaller.ts

@@ -79,6 +79,13 @@ export async function callModerationLLM(
             jsonResponse: { type: "json_object" },
             retries: 0,
             signal,
+            // Router (9router/omniroute) always streams SSE even when the
+            // request omits `stream`. In non-stream mode the OpenAI SDK waits
+            // for the FULL body before parsing, so slow/long upstream streams
+            // hit the 30s/60s timeout and abort mid-generation. Streaming mode
+            // consumes chunks incrementally — timeout only fires on a real
+            // stall. llmClient aggregates the stream into a ChatCompletion.
+            stream: true,
           });
 
           if (!completion)