Initial commit: HK Planner app

Housekeeping workload and hours planning app — port of the WP hotel
housekeeping hours calculator plugin. 7-day occupancy planner with
Newbook PMS integration, staff rota, time requirements, and pickup tracking.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,15 @@
+# PostgreSQL connection string for the hk-planner DB
+DATABASE_URL=postgres://user:pass@host:5432/hk_planner
+
+# Shared secret used to verify hnf_session JWTs (same as auth service)
+CENTRAL_AUTH_SECRET=change-me
+
+# Settings service (for Newbook credentials)
+SETTINGS_URL=http://settings-backend:3001
+SETTINGS_SECRET=change-me
+
+# Hotel name shown on the login page
+VITE_HOTEL_NAME=Hotel Name
+
+# Host port to expose the frontend on (default 3080)
+FRONTEND_PORT=3080