refactor: atomic, DRY, and logging improvements across codebase

- Split llmModerationClient.ts (2170 lines) into 5 focused sub-modules
- Split aiAnalyzer.ts (1282 lines) into 4 modular pipelines
- Split messages.db.ts (826 lines) into 5 domain-specific modules
- Moved shared schema to @bete/shared, eliminated backend duplication
- Added createChildLogger to all voice-recording and AI moderation modules
- Extracted tryCommandThenFallback, normalizeMediaState, DEFAULT_VOICE_STATUS
- Created shared pagination.ts utility, eliminated 5+ cursor-pagination duplications
- Created shared messageMapper.ts for row mapping
- Standardized backend error handling with asyncHandler
- Added frontend createLogger utility and useAsyncAction hook
- Added structured logging to frontend hooks, socket, and API client

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

services/backend/src/modules/analysis/analysis.repository.ts

@@ -1,5 +1,9 @@
 import { createChildLogger } from "@bete/shared/logger";
 import { getPool } from "../../shared/database/index.js";
+import {
+  type MappedMessage,
+  mapMessageRow,
+} from "../../shared/utils/messageMapper.js";
 
 const logger = createChildLogger("analysis.repository");
 
@@ -10,61 +14,8 @@ export interface AnalysisSearchQuery {
   limit?: number;
 }
 
-export interface AnalysisSearchResult {
-  id: string;
-  guild_id: string;
-  channel_id: string;
-  thread_id: string | null;
-  user_id: string;
-  username: string;
-  avatar_url: string | null;
-  content: string;
-  edited_content: string | null;
-  created_at: number;
-  edited_at: number | null;
-  deleted_at: number | null;
-  type: string;
-  metadata: string | null;
-  ai_status: string | null;
-  ai_moderation_flags: string | null;
-  ai_moderation_score: number | null;
-  ai_analysis: string | null;
-  ai_categories: string | null;
-  ai_severity: string | null;
-  ai_confidence: number | null;
-  ai_recommended_action: string | null;
-  ai_analyzed_at: number | null;
-  ai_error: string | null;
-}
-
-function mapSearchResult(row: Record<string, unknown>): AnalysisSearchResult {
-  return {
-    id: String(row.id ?? ""),
-    guild_id: String(row.guild_id ?? ""),
-    channel_id: String(row.channel_id ?? ""),
-    thread_id: (row.thread_id as string | null) ?? null,
-    user_id: String(row.user_id ?? ""),
-    username: String(row.username ?? ""),
-    avatar_url: (row.avatar_url as string | null) ?? null,
-    content: String(row.content ?? ""),
-    edited_content: (row.edited_content as string | null) ?? null,
-    created_at: Number(row.created_at ?? 0),
-    edited_at: (row.edited_at as number | null) ?? null,
-    deleted_at: (row.deleted_at as number | null) ?? null,
-    type: String(row.type ?? "text"),
-    metadata: (row.metadata as string | null) ?? null,
-    ai_status: (row.ai_status as string | null) ?? null,
-    ai_moderation_flags: (row.ai_moderation_flags as string | null) ?? null,
-    ai_moderation_score: (row.ai_moderation_score as number | null) ?? null,
-    ai_analysis: (row.ai_analysis as string | null) ?? null,
-    ai_categories: (row.ai_categories as string | null) ?? null,
-    ai_severity: (row.ai_severity as string | null) ?? null,
-    ai_confidence: (row.ai_confidence as number | null) ?? null,
-    ai_recommended_action: (row.ai_recommended_action as string | null) ?? null,
-    ai_analyzed_at: (row.ai_analyzed_at as number | null) ?? null,
-    ai_error: (row.ai_error as string | null) ?? null,
-  };
-}
+// AnalysisSearchResult is identical to MappedMessage — reuse the shared mapper
+export type AnalysisSearchResult = MappedMessage;
 
 export class AnalysisRepository {
   async search(query: AnalysisSearchQuery): Promise<AnalysisSearchResult[]> {
@@ -107,7 +58,7 @@ export class AnalysisRepository {
       [...params, limit],
     );
 
-    return rows.map((r) => mapSearchResult(r as Record<string, unknown>));
+    return rows.map((r) => mapMessageRow(r as Record<string, unknown>));
   }
 }