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>

docker/prometheus/prometheus.yml

@@ -77,12 +77,7 @@ scrape_configs:
     metrics_path: '/metrics'
     scrape_interval: 30s
 
-  # Clock Backend
-  - job_name: 'clock-backend'
-    static_configs:
-      - targets: ['clock-backend:3033']
-    metrics_path: '/metrics'
-    scrape_interval: 30s
+  # Clock Backend: REMOVED — migrated to local-first
 
   # Contacts Backend
   - job_name: 'contacts-backend'
@@ -126,12 +121,7 @@ scrape_configs:
     metrics_path: '/metrics'
     scrape_interval: 30s
 
-  # Zitare Backend
-  - job_name: 'zitare-backend'
-    static_configs:
-      - targets: ['zitare-backend:3007']
-    metrics_path: '/metrics'
-    scrape_interval: 30s
+  # Zitare Backend: REMOVED — migrated to local-first
 
   # Mukke Backend
   - job_name: 'mukke-backend'