fix(ai-moderation): remove indonesianTextNormalizer to stop hallucinated slang flags

The rule-based badword detector was injecting [normalized_text] and
[normalization_notes] tags into the LLM prompt that caused false
positive hallucinations - the LLM started associating innocent words
('sapik', 'furina') with furry/sexual_deviation due to misleading
context injected by the normalizer.

Removed:
- indonesianTextNormalizer.ts (full file deletion)
- formatModerationTextEvidenceForPrompt import/usage in llmModerationClient
- formatModerationTextEvidenceForPrompt import/usage in conversationContext
- stale re-exports in index.ts

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -1,8 +1,3 @@
 export { startPendingAIAnalysisWorker } from "./aiAnalyzer.js";
-export {
-  buildModerationTextEvidence,
-  detectIndonesianBadwords,
-  normalizeDiscordCustomEmoji,
-} from "./indonesianTextNormalizer.js";
 export { runModerationAnalysis } from "./llmModerationClient.js";
 export { buildSystemPrompt } from "./moderationPrompt.js";