feat(moderation): skip AI analysis for music bots via AI_SKIP_ANALYSIS_USER_IDS

Jockie Music (user 411916947773587456) posts now-playing embeds/spotify links
~1347 captured messages — every one consumed a moderation LLM call for zero
signal and contributed to batch timeouts. Config AI_SKIP_ANALYSIS_USER_IDS
(default=Jockie) skips them at ALL three analysis paths:
- queueMessageAnalysis entry (direct skip-result like age-restricted)
- batchScheduler processing (pre-batch filter)
- individual recovery path (no fallback spam for already-skipped authors)

Skip-result mirrors age_restricted: status=clean, flags=[skip_analysis_user],
action=none — stays visible in the dashboard, never analyzed.

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

@@ -6,6 +6,7 @@ import {
   pickBatchWithinBudget,
   processBatch,
   skipAgeRestrictedMessages,
+  skipAnalysisUserMessages,
 } from "./batchProcessor.js";
 import {
   conversationConsecutiveErrors,
@@ -81,7 +82,9 @@ export function scheduleConversationAnalysis(conversationKey: string): void {
           return;
         }
 
-        const processableMessages = await skipAgeRestrictedMessages(messages);
+        const processableMessages = await skipAnalysisUserMessages(
+          await skipAgeRestrictedMessages(messages),
+        );
         if (processableMessages.length === 0) {
           if (
             conversationProcessing.get(conversationKey) === processingStartedAt