refactor: comprehensive codebase cleanup and architecture hardening

- Sprint 1 (Quick Wins): Remove dead analytics modules, fix 4 unresolved
  imports, replace 3 console.warn with logger, remove mock-crc import
- Sprint 2 (Architecture): Create MascotChatRepository, AnalysisRepository,
  3 Zod schemas (mascot-chat, analysis, voice), deduplicate error classes,
  move 3 SQL queries from routes to repository
- Sprint 3 (Complexity): Replace 7 any types with proper interfaces,
  extract 6 helpers from prepareMediaMessage (CC 85 -> ~15)
- Sprint 4 (Config): Remove 22 dead env vars from .env, add 30 missing
  vars to .env.example, standardize naming

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

services/frontend/src/shared/hooks/useMascotSummary.ts

@@ -34,7 +34,7 @@ function generateInsight(messages: MessageRecord[]): string {
   // Hitung average panjang pesan
   const avgLength = Math.round(
     recentMessages.reduce((sum, m) => sum + (m.content?.length || 0), 0) /
-      recentMessages.length
+      recentMessages.length,
   );
 
   // Tentukan tipe percakapan