fix: correct import paths and add missing protocol files for DDD structure

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/interfaces/http/controllers/health-controller.ts

@@ -0,0 +1,25 @@
+import { sql } from 'drizzle-orm';
+import { db } from '../../../db';
+import { getErrorMessage } from '../../../shared/utils/file';
+import logger from '../../../utils/logger';
+
+/**
+ * Handles the health-check endpoint.
+ *
+ * Verifies database connectivity by executing a simple `SELECT 1` query.
+ * Returns a 200 response with `{ status: 'ok' }` when the database is
+ * reachable, or a 500 response with the error details when it is not.
+ *
+ * @param _req - The incoming HTTP request (unused).
+ * @returns A JSON response indicating the database health status.
+ */
+export const handleHealth = async (_req: Request): Promise<Response> => {
+  try {
+    await db.execute(sql`SELECT 1`);
+    return Response.json({ status: 'ok' }, { status: 200 });
+  } catch (error: unknown) {
+    const message = getErrorMessage(error);
+    logger.error('Health check failed', { error: message });
+    return Response.json({ status: 'error', error: message }, { status: 500 });
+  }
+};