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/mascot-chat/mascot-chat.routes.ts

@@ -1,5 +1,4 @@
 import express, { type Router } from "express";
-import { asyncHandler } from "../../shared/middlewares/index.js";
 import {
   clearMascotChatHistory,
   getMascotChatHistory,
@@ -9,9 +8,9 @@ import {
 export function createMascotChatRouter(): Router {
   const router = express.Router();
 
-  router.post("/mascot/chat", asyncHandler(handleMascotChat));
-  router.get("/mascot/chat/history", asyncHandler(getMascotChatHistory));
-  router.delete("/mascot/chat/history", asyncHandler(clearMascotChatHistory));
+  router.post("/mascot/chat", handleMascotChat);
+  router.get("/mascot/chat/history", getMascotChatHistory);
+  router.delete("/mascot/chat/history", clearMascotChatHistory);
 
   return router;
 }