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>

packages/shared-hono/src/error.ts

@@ -0,0 +1,47 @@
+/**
+ * Error handling middleware for Hono servers.
+ *
+ * Catches unhandled errors and returns consistent JSON responses.
+ */
+
+import type { Context } from 'hono';
+import { HTTPException } from 'hono/http-exception';
+
+/**
+ * Global error handler — register with `app.onError(errorHandler)`.
+ *
+ * Usage:
+ * ```ts
+ * import { errorHandler } from '@manacore/shared-hono/error';
+ * const app = new Hono();
+ * app.onError(errorHandler);
+ * ```
+ */
+export function errorHandler(err: Error, c: Context) {
+	if (err instanceof HTTPException) {
+		return c.json(
+			{
+				error: err.message,
+				status: err.status,
+			},
+			err.status
+		);
+	}
+
+	console.error('[error]', err);
+
+	return c.json(
+		{
+			error: 'Internal server error',
+			status: 500,
+		},
+		500
+	);
+}
+
+/**
+ * Not-found handler — register with `app.notFound(notFoundHandler)`.
+ */
+export function notFoundHandler(c: Context) {
+	return c.json({ error: 'Not found', status: 404 }, 404);
+}