refactor(infra): remove zitare + clock NestJS backends, add shared-hono package

Both apps are fully local-first via Dexie.js + mana-sync. Their NestJS
backends were pure CRUD wrappers (20 + 31 source files) that are no
longer needed.

Changes:
- Add packages/shared-hono: JWT auth via JWKS (jose), Drizzle DB factory,
  health route, generic GDPR admin handler, error middleware
- Migrate zitare lists page from fetch() to listsStore (local-first)
- Rewrite clock timers store from API-based to timerCollection (Dexie)
- Update clock +layout.svelte CommandBar search to use local collections
- Remove zitare-backend + clock-backend from docker-compose, CI/CD,
  Prometheus, env generation, setup scripts
- Add docs/TECHNOLOGY_AUDIT_2026_03.md with full repo analysis

Net result: -2 Docker containers, -2 ports, -2728 lines of code

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/mac-mini/ensure-containers-running.sh

@@ -154,7 +154,6 @@ for container in $ALL_PROBLEM_CONTAINERS; do
         mana-app-calendar-web) SERVICE_NAME="calendar-web" ;;
         mana-app-calendar-backend) SERVICE_NAME="calendar-backend" ;;
         mana-app-clock-web) SERVICE_NAME="clock-web" ;;
-        mana-app-clock-backend) SERVICE_NAME="clock-backend" ;;
         mana-app-contacts-web) SERVICE_NAME="contacts-web" ;;
         mana-app-contacts-backend) SERVICE_NAME="contacts-backend" ;;
         mana-app-storage-web) SERVICE_NAME="storage-web" ;;