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>
