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>

pnpm-lock.yaml

@@ -33,6 +33,9 @@ importers:
 
   packages/shared:
     dependencies:
+      drizzle-orm:
+        specifier: ^0.45.2
+        version: 0.45.2(@opentelemetry/api@1.9.1)(@types/better-sqlite3@7.6.13)(@types/pg@8.20.0)(better-sqlite3@11.10.0)(pg@8.21.0)
       pino:
         specifier: ^9.0.0
         version: 9.14.0