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/setup-databases.sh

@@ -104,7 +104,7 @@ setup_service() {
             ;;
         zitare)
             create_db_if_not_exists "zitare"
-            push_schema "@zitare/backend" "zitare"
+            # Schema managed by mana-sync (backend removed)
             ;;
         contacts)
             create_db_if_not_exists "contacts"
@@ -116,7 +116,7 @@ setup_service() {
             ;;
         clock)
             create_db_if_not_exists "clock"
-            push_schema "@clock/backend" "clock"
+            # Schema managed by mana-sync (backend removed)
             ;;
         todo)
             create_db_if_not_exists "todo"